Photovoltaic Materials and Devices for

Polymer Solar Cells

Date: 15 May 2014 (Thur)

Time: 11:00 a.m. Venue: RRS 905, Conference Room Sir Run Run Shaw Building Ho Sin Hang Campus Hong Kong Baptist University

*All Interested are Welcome*

Department of Chemistry

Prof. Yongfang Li ¾Academician of Chinese Academy of Sciences ¾Professor of Chemistry, CAS Key Laboratory of Organic Solids, Institute of Chemistry, CAS

Sponsored by Hung Hin Shiu Charitable Foundation

Conjugated Polymer Optoelectronic Materials

and Devices

Date: 16 May 2014 (Fri)

Time: 11:00 a.m. Venue: RRS 905, Conference Room Sir Run Run Shaw Building Ho Sin Hang Campus Hong Kong Baptist University

*All Interested are Welcome*

Sponsored by Hung Hin Shiu Charitable Foundation

Department of Chemistry

Prof. Yongfang Li ¾Academician of Chinese Academy of Sciences ¾Professor of Chemistry, CAS Key Laboratory of Organic Solids, Institute of Chemistry, CAS

Speaker’s Biography

Education: Master Degree was obtained in 1982 in Department of Chemistry, East China Institute of Chemical Technology (present name: East China University of Science and Technology), Shanghai 200237, China. Physical Chemistry Specialty Ph.D. degree was obtained in 1986 in Department of Chemistry, Fudan University. Shanghai 200433, China. Physical Chemistry Specialty (Electrochemistry). Research career:

y 1986.8. – 1988.8., Postdoctoral fellow in Institute of Chemistry, CAS (ICCAS), Beijing 100190, China. Doing the research on the electrochemistry of conducting polymers with Prof. Renyuan Qian.

y 1988.9. – present, staff of ICCAS, Beijing 100190, China. 1993.- present, Professor.

y 1988.10.-1991.4., Visiting scholar, Institute for Molecular Science (IMS), Okazaki, Japan. Doing research on organic conductors and organic semiconductors in Prof. Hiroo Inokuchi’s group.

y 1997.6. – 1998.6., Visiting Scientist, Institute for Polymers and Organic Solids, UCSB, USA. Doing the research on polymer light-emitting electrochemical cells in Prof. Alan J. Heeger’s group.

Awards:

y 1995, Winning the Second-Grade National Award of China on Natural Sciences, for  the  contribution  in  “The  studies  on  conducting  polypyrrole”

y 1998, named as “Young and Middle-aged Specialist with Outstanding Contributions in Natural Science” by Chinese government.

y 2005, Winning the First-Grade Award of Beijing City on Science and Technology,

Prof. Yongfang Li

� Academician of Chinese Academy of Sciences

� Professor of Chemistry, CAS Key Laboratory of

Organic Solids, Institute of Chemistry, CAS

for the contribution in “The studies on the electrochemistry of conducting polymers and polymer light-emitting electrochemical cells”

y 2012, winning “Macro2012 Lecture Award” by PMSE of ACS (American Chemical Society).

Present research interests:

Polymer solar cells and related photovoltaic materials (including conjugated polymer donor, fullerene derivative acceptor and solution-processable organic molecule donor materials) and interfacial buffer layer materials. Publications:

Two books, more than 10 book chapters and more than 400 research papers have been published in the fields of conjugated polymer optoelectronic materials and devices, electrochemistry of conducting polymers and semiconductor nanocrystals. The published papers have been cited by others for more than 12600 times, h-factor: 60.

Selected publications:

Books and book chapters:

1. Y. F. Li, Y. J. He, Y. Zhou, edited, “Materials and Devices for Polymer Solar Cells” (in Chinese), Chemical Industry Press of China, 2013, Beijing.

2. H. Q. Wu, Y. F. Li,  edited,  “Electrochemical Kinetics”  (in  Chinese), High Education Press & Springer, 1998, Beijing.

3. Y. F. Li, Q. B. Pei, “Electrochemistry   of   Conjugated   Polymers”, Chapter 1 in

“Iontronics: Ionic Carriers in Organic Electronic Materials and Devices”, (Eds. Janelle Leger, Magnus Berggren and Sue Carter) CRC Press, Taylor & Francis Group, New York, 2010, pp. 1-28.

4. Y. F. Li，J. H. Hou, “Major   classes   of   conjugated   polymers   and   synthetic  strategies”,  Chapter  6   in “Introduction to Organic Electronic and Optoelectronic Materials   and  Devices”   (Eds.   Sun  &  Dalton)   CRC   Press,   Taylor  &   Francis  Group,  New York, 2008, pp. 173-209.

5. Y. F. Li，J. H. Hou，“Luminescent polymers”， Chapter  11  in  “Specialty Polymers: Materials and Applications”,   edited   by   Faiz   Mohammad,   I.K.   International  Publishing House Pvt. Ltd., New Delhi, 2007, pp. 397-418.

6. Y. F. Li, “Electrochemical preparation of conducting   polypyrrole   films”, in “Polymers   and  Organic   Solids”,   (edited by L.H. Shi and D.B. Zhu), Science Press (China), 1997, Beijing, pp. 228-244.

7. Y. W. Tan, Y. F. Li, D. B. Zhu, “Noble metal nanoparticles“, in Encyclopedia of

Nanoscience and Nanotechnology, Vol. 8, Edited by H.S. Nalwa, American Scientific Publishers, 2004, California, pp. 9-40.

8. H. Z. Zhong, Y. Zhou, Y. F. Li, “Anisotropic   Semiconductor   Nanocrystals”, in Encyclopedia of Nanoscience and Nanotechnology, Vol. 11（Chapter 195）， Edited by H.S. Nalwa, American Scientific Publishers, 2011.

Review articles:

1. Yongfang Li,  “Molecular  Design  of  Photovoltaic  Materials  for  Polymer  Solar  Cells:  Towards  Suitable  Electronic  Energy  Levels  and  Broad  Absorption”,  Acc. Chem. Res. 2012, 45, 723–733.

2. Yuze Lin, Yongfang Li and Xiaowei Zhan*, “Small  molecule  semiconductors  for  high-efficiency  organic  photovoltaics”, Chem. Soc. Rev., 2012, 41, 4245-4272

3. Yuze Lin, Haijun Fan, Yongfang Li,* and Xiaowei Zhan*, “Thiazole-Based Organic Semiconductors for Organic Electronics”, Adv. Mater., 2012, 24, 3087-3106.

4. Yongfang Li*, Yingping Zou, "Conjugated Polymer Photovoltaic Materials with Broad Absorption Band and High Charge Carrier Mobility", Adv. Mater., 2008, 20, 2952-2958.

5. Youjun He, Yongfang Li*, “Fullerene  derivative  acceptors  for  high  performance  polymer  solar  cells”, Phys. Chem. Chem. Phys., 2011, 13, 1970-1983.

6. Yongfang Li, "Fullerene bisadduct acceptor photovoltaic materials for polymer solar cells", Chem. Asian J., 2013. 8(10), 2316-2328.

Research papers:

(1) Conjugated polymer photovoltaic materials

1. Y. Huang, X. Guo, F. Liu, L. J. Huo, Y. N. Chen, T. P. Russell*, C. C. Han, Y. F. Li*, J. H. Hou*, “Improving the ordering and photovoltaic properties by extending the π–conjugated area of electron-donating units in polymers with D-A   structure”, Adv. Mater. 2012, 24, 3383–3389.

2. X. Guo, M. J. Zhang,* J. H. Tan, S. Q. Zhang, L. J. Huo, W. P. Hu,* Y. F. Li,* J. H. Hou*,  “Influence of D/A Ratio on Photovoltaic Performance of a Highly Efficient Polymer Solar Cell System”,  Adv. Mater., 2012, 24, 6536–6541.

3. X.W. Zhan*, Z.A. Tan, B. Domercq, Z.S. An, X. Zhang, S. Barlow, Y.F. Li*, D.B. Zhu*, B. Kippelen*, S. R. Marder*， “A  High-Mobility Electron-Transport Polymer with Broad Absorption and its use in All-Polymer Solar Cells and Field-Effect Transistors”, J. Am. Chem. Soc. 2007, 129: 7246-7247.

4. J. H. Hou, Z. A. Tan, Y. Yan, Y. J. He, C. H. Yang, Y. F. Li*, “Synthesis and photovoltaic properties of two-dimensional conjugated polythiophenes with bi(thienylenevinylene) side chains”, J. Am. Chem. Soc., 2006, 128: 4911-4916.

5. Lijun Huo, Shaoqing Zhang, Xia Guo, Feng Xu, Yongfang Li,* Jianhou Hou*， “Replacement   of   Alkoxy   with   Alkylthienyl: A Feasible Approach to Improve Photovoltaic Properties of PBDTTT-based  Polymers”, Angew. Chem. Int. Ed., 2011, 50, 9697-9702.

6. Chaohua Cui, Wai-Yeung Wong*, Yongfang Li*, “Improvement of Open-Circuit Voltage and Photovoltaic Properties of 2D-Conjugated Polymers by Alkylthio Substitution”, Energy Environ. Sci. 2014, DOI: 10.1039/C4EE00446A.

7. Maojie Zhang, Xia Guo, Yongfang Li*, “Synthesis and characterization of a copolymer based on thiazolothiazole  and  dithienosilole  for  polymer  solar  cells”, Adv. Energy Mater. 2011, 1, 557–560.

8. Lijun Huo, Ye Huang, Benhu Fan, Xia Guo, Yan Jing, Yongfang Li*, Jianhui Hou*, "Synthesis of 4,8-dialkoxy-benzo[1,2-b:4,5-b']difuran unit and its application in photovoltaic polymer", Chem. Commun., 2012, 48, 3318-3320.

9. Ye Huang, Lijun Huo, Shaoqing Zhang, Xia Guo, Charles C. Han*, Yongfang Li*, Jianhui Hou*, “Sulfonyl: a new application of electron-withdrawing substituent in   highly   efficient   photovoltaic   polymer”, Chem. Commun. 2011, 47, 8904 – 8906.

10. Lijun Huo, Xia Guo, Yongfang Li*,   Jianhui   Hou*,   “Synthesis   of   a polythieno[3,4-b]thiophene derivative with low-lying HOMO level and its application in polymer solar cells”,  Chem. Commun. 2011, 47, 8850 - 8852.

11. Zhi-Guo Zhang, Jie Min, Siyuan Zhang, Jing Zhang, Yongfang Li*, “Alkyl   chain   engineering on dithieno[3,2-b:2’,3’-d]silole-alt- dithienylthiazolo[5,4-d]thiazole copolymer toward high performance bulk   heterojunction   solar   cell”, Chem. Commun. 2011, 47, 9474 – 9476.

12. Chaohua Cui, Xi Fan, Maojie Zhang, Jing Zhang, Jie Min and Yongfang Li*, “D-A copolymer of dithienosilole and a new acceptor unit of naphtho[2,3-c]thiophene-4,9-dione for efficient polymer   solar   cells”, Chem. Commun. 2011, 47, 11345 - 11347.

13. J. H. Hou, C.H. Yang, C. He, Y. F. Li*, “Poly[3-(5-octyl-thienylene- vinyl)-thiophene]: a side-chain conjugated polymer with very broad absorption”, Chem. Commun.，2006, 871-873.

14. Jie Min, Zhi-Guo Zhang*, Siyuan Zhang, Yongfang Li*, "Conjugated Sidechain Isolated D-A Copolymers based on Benzo[1,2-b:4,5-b']dithiophene-alt-dithienylbenzotriazole: Synthesis and Photovoltaic Properties", Chem. Mater. 2012, 24, 3247–3254.

15. Maojie Zhang, Xia Guo, Xiaochen Wang, Haiqiao Wang, Yongfang Li*, “Synthesis and photovoltaic properties of D-A copolymers based on alkyl-substituted indacenodithiophene donor unit”, Chem. Mater. 2011, 23, 4264-4270.

16. Shaowei Shi, Xiaodong Xie, Pei Jiang, Song Chen, Liwei Wang, Meng Wang, Haiqiao Wang*, Xiaoyu Li*, Gui Yu*, and Yongfang Li*, “Naphtho[1,2-b:5,6-b’]dithiophene-Based Donor-Acceptor Copolymer Semiconductors for High-Mobility Field-Effect Transistors and Efficient Polymer Solar  Cells”, Macromolecules, 2013, 46, 3358−3366.

17. Xiaochen Wang, Pei Jiang, Yu Chen, Hao Luo, Zhiguo Zhang, Haiqiao Wang*, Xiaoyu Li*, Gui Yu*, and Yongfang Li*, “Thieno[3,2-b]thiophene-Bridged D-π-A Polymer Semiconductor Based on Benzo[1,2-b:4,5-b']dithiophene and Benzoxadiazole”, Macromolecules, 2013, 46, 4805-4812.

18. Ping Shen, Haijun Bin, Lu Xiao, Yongfang Li*, “Enhancing  Photovoltaic   Performance of Copolymers Containing Thiophene Unit with D-A Conjugated Side  Chain  by  Rational  Molecular  Design”, Macromolecules, 2013, 46, 9575-9586.

19. Zhi-Guo Zhang, Siyuan Zhang, Jie Min, Chaohua Cui, Jing Zhang, Yongfang Li*, “Conjugated  side-chain isolated polythiophene: synthesis and photovoltaic application”,  Macromolecules, 2012, 45,  113−118.

20. Xiaochen Wang, Yeping Sun,Song Chen, Xia Guo, Maojie Zhang, Xiaoyu Li* , Yongfang Li*,  and  Haiqiao  Wang*,  “Effects  of  π-Conjugated Bridges on Photovoltaic Properties of Donor-π-Acceptor Conjugated  Copolymers”,   Macromolecules, 2012, 45, 1208–1216.

21. Zhi-Guo Zhang, Siyuan Zhang, Jie Min, Chaohua Cui, Hua Geng, Zhigang Shuai, Yongfang Li*,  “Side  chain  engineering  of  polythiophene  derivatives  with   thienylene-vinylene conjugated side chain for the application in polymer solar cells”,  Macromolecules, 2012, 45, 2312–2320.

22. Xia Guo, Maojie Zhang*, Lijun Huo, Chaohua Cui, Yue Wu, Jianhui Hou* and Yongfang Li*, “Poly(thieno[3,2-b]thiophene-alt-bithiaozle): a D-A copolymer donor showing improved photovoltaic performance with indene-C60 bisadduct as acceptor”,  Macromolecules, 2012. 45, 6930–6937.

23. Bo Liu, Xuewen Chen, Yingping Zou,* Lu Xiao, Xinjun Xu, Yuehui He,*, Lidong Li, Yongfang Li*,  “Benzo[1,2-b:4,5-b’]difuran  Based  Donor-Acceptor Copolymers for  Polymer  Solar  Cells”,  Macromolecules, 2012, 45, 6898–6905.

24. Shaowei Shi, Pei Jiang, Song Chen, Yeping Sun, Xiaochen Wang, Kai Wang, Suling Shen, Xiaoyu Li* , Yongfang Li*,  and  Haiqiao  Wang*,  “Effect  of   -bridge length on the photovoltaic properties of D-A copolymers  based  on  carbazole  and  quinoalinoporphyrin”,  Macromolecules, 2012, 45, 7806−7814.

25. Lijun Huo, Xia Guo, Shaoqing Zhang, Yongfang Li*, Jianhui Hou*, “PBDTTTZ: A broad band gap conjugated polymer with high photovoltaic performance in

polymer solar  cells”,  Macromolecules, 2011, 44, 4035–4037. 26. Maojie Zhang, Yeping Sun, Xia Guo, Chaohua Cui, Youjun He, Yongfang Li*,

“Synthesis   and   characterization   of dioctyloxybenzo[1,2-b: 4, 3-b’]dithiophene-containing copolymers for polymer solar cells”, Macromolecules, 2011, 44, 7625-7631.

27. Jie Min, Zhi-Guo Zhang*, Siyuan Zhang, Maojie Zhang, Jing Zhang, Yongfang Li*, “Synthesis   and   photovoltaic   properties   of   D-A copolymers based on dithienosilole  and  benzotriazole”, Macromolecules, 2011, 44, 7632-7638.

28. Maojie Zhang, Xia Guo, and Yongfang Li*, “Photovoltaic Performance Improvement of D-A Copolymers Containing Bithiazole Acceptor Unit by Using Bithiophene Bridges”, Macromolecules, 2011, 44, pp 8798–8804.

29. Maojie Zhang, Haijun Fan, Xia Guo, Youjun He, Zhiguo Zhang, Jie Min, Jing Zhang, Xiaowei Zhan* and Yongfang Li*，“Synthesis   and   photovoltaic properties of bithiazole-based donor-acceptor copolymers”，Macromolecules, 2010, 43, 5706–5712.

30. Maojie Zhang, Haijun Fan, Xia Guo, Youjun He, Zhi-Guo Zhang, Jie Min, Jing Zhang, Xiaowei Zhan and Yongfang Li*,  “Synthesis  and  photovoltaic properties of  a  copolymer  of  benzodithiophene  and  bithiazole”,  Macromolecules，2010, 43, 8714–8717.

31. Zhi-Guo Zhang, Yi-Liang Liu, Yang Yang, Bo Peng, Guangjin Zhao, Maojie Zhang, Xia Guo, En-Tang Kang, Yongfang Li*,  “Alternative  copolymers  of carbazole and triphenylamine with conjugated side chain attaching acceptor groups: synthesis and  photovoltaic  application”,  Macromolecules, 2010, 43, 9376–9383.

32. Lijun Huo, Teresa L. Chen, Yi Zhou, Jianhui Hou, Yang Yang*, Yongfang Li,*

“Improvement of photoluminescent and photovoltaic properties of Poly(thienylene vinylene) by carboxylate substitution”,  Macromolecules, 2009, 42, 4377-4380.

33. Youjun He, Weiping Wu, Guangjin Zhao, Yunqi Liu*, Yongfang Li*, “Poly(3,6-dihexyl-thieno [3,2-b] thiophene vinylene): Synthesis, Field-Effect Transistors and Photovoltaic Properties”, Macromolecules 2008, 41, 9760-9766.

34. Ping Shen, Guangyi Sang, Junjian Lu, Bin Zhao, Meixiu Wan, Yingping Zou, Yongfang Li*, Songting Tan*, “Effect of 3-D�S�S�stacking on photovoltaic and electroluminescent properties in triphenylamine-containing poly(p-phenylenevinylene) derivatives”, Macromolecules, 2008, 41: 5716-5712.

35. Y.P. Zou, W.P. Wu, G.Y. Sang, Y. Yang, Y.Q. Liu*, Y.F. Li*, “Polythiophene  derivative with phenothiazine-vinylene conjugated side chain: synthesis and its application in field-effect transistors”, Macromolecules, 2007, 40: 7231-7237.

36. E.J. Zhou, Z.A. Tan, Y. Yang, L.J. Huo, Y.P. Zou, C.H. Yang, Y.F. Li*,  “Synthesis,  hole   Mobility and photovoltaic properties of cross-linked polythiophenes with vinylene-terthiophene-vinylene as conjugated bridge”, Macromolecules, 2007, 40, 1831-1837.

37. Z.A. Tan, J.H. Hou, Y.J. He, E.J. Zhou, C.H. Yang, Y.F. Li*, “Synthesis and photovoltaic properties of a donor-acceptor double-cable polythiophene with high content of C60 pendant”, Macromolecules, 2007, 40, 1868-1873.

38. J.H. Hou, L.J. Huo, C. He, C.H. Yang, Y. F. Li*，“Synthesis and Absorption Spectra of Poly[3-(phenylene-vinyl) thiophene] with Conjugated Side-Chains", Macromolecules, 2006, 39: 594-603.

39. J.H. Hou, Z.A. Tan, Y.J. He, C.H. Yang, Y.F. Li*，“Branched poly(thienylene vinylene)s with absorption spectra covering the whole visible region”， Macromolecules 2006, 39: 4657-4662.

40. Y.P. Zou, J.H. Hou, C.H. Yang, Y.F. Li*, “A novel n-type conjugated polymer DOCN-PPV: synthesis, optical and electrochemical properties”, Macromolecules , 2006, 38: 8889-8891.

41. Ye Huang, Mingqian Zhang, Long Ye, Xia Guo, Charles C. Han*, Yongfang Li*, Jianhui Hou*, “Molecular energy level modulation by changing the position of electron-donating side groups”, J. Mater. Chem., 2012, 22, 5700-5705.

42. Shaowei Shi, Xiaochen Wang, Yeping Sun, Song Chen, Xiaoyu Li*, Yongfang Li*, Haiqiao Wang*,  “Porphyrin-Containing D-π-A Conjugated Polymer with Absorption over the Entire Spectrum of Visible Light and its Applications in Solar Cells”,  J. Mater. Chem., 2012, 22, 11006-11008.

43. Xuewen Chen, Bo Liu, Yingping Zou*, Lu Xiao, Xiuping Guo, Yuehui He, Yongfang

Li,  “A New Benzo[1,2-b:4,5-b’]difuran-Based Copolymer for Efficient Polymer Solar  Cells”, J. Mater. Chem., 2012, 22, 17724-17731.

44. Xiaowei Zhan*, Zhan'ao Tan, Erjun Zhou, Yongfang Li*, Rajneesh Misra, Adrian Grant,§ Benoit Domercq, Xiao-Hong Zhang, Zesheng An, Xuan Zhang, Stephen Barlow, Bernard Kippelen, and Seth R. Marder*，“Copolymers of Perylene Diimide with Dithienothiophene and Dithienopyrrole as Electron-Transport Materials for All-Polymer Solar Cells and Field-Effect Transistors”，J. Mater. Chem., 2009, 19, 5794-5803.

45. Shaowei Shi, Pei Jiang, Shunquan Yu, Liwei Wang, Xiaochen Wang, Meng Wang, Haiqiao Wang*, Yongfang Li* and Xiaoyu Li*,  “Efficient polymer solar cell based on a broad bandgap D-A copolymer of "zig-zag" naphthodithiophene and thieno[3,4-c]pyrrole-4,6-dione”,  J. Mater. Chem. A, 2013, 1, 1540-1543.

46. Xiaochen Wang, Zhi-Guo Zhang, Hao Luo, Song Chen, Shunquan Yu, Haiqiao Wang*, Xiaoyu Li*, Gui Yu*, and Yongfang Li*, “Effects of Fluorination on the

Properties of Thieno[3,2-b]thiophene-Bridged Donor-π-Acceptor Polymer Semiconductors”, Polym. Chem. 2014, 5, 502-511.

47. Ping Shen, Haijun Bin, Yi Zhang, Yongfang Li*, “Synthesis and optoelectronic properties of new D-A copolymers based on fluorinated benzothiadiazole and benzoselenadiazole”, Polymer Chemistry. 2014, 5, 567 - 577.

48. Bo Liu, Xuewen Chen, Yingping Zou*, Yuehui He, Lu Xiao, Xinjun Xu, Lidong Li, Yongfang Li*, “A Benzo[1,2-b:4,5-b’]difuran- and Thieno-[3,4-b]thiophene-Based Low Bandgap Copolymer for Photovoltaic Applications”, Polym. Chem., 2013, 4, 470-476.

49. Yi Zhang, Lei Gao, Chang He, Qingjiang Sun*, Yongfang Li*,  “Synthesis and photovoltaic properties of two-dimension-conjugated D-A copolymers based on benzodithiophene or benzodifuran units”, Polym. Chem. 2013, 4, 1474-1481.

50. Jie Min, Zhi-Guo Zhang*, Maojie Zhang, Yongfang Li*,  “Synthesis and photovoltaic properties of a D-A copolymer of dithienosilole and fluorine-substituted-benzotriazole”,  Polym. Chem. 2013, 4, 1467-1473

51. Chaohua Cui, Haijun Fan, Xia Guo, Maojie Zhang, Youjun He, Xiaowei Zhan and Yongfang Li*,  “Synthesis  and  photovoltaic  properties  of  D-A copolymers of benzodithiohene and naphtho[2,3-c]thiophene-4,9-dione”,  Polym. Chem. 2012, 3, 99 -104.

52. Zhi-Guo Zhang, Haijun, Fan, Jie Min, Jing Zhang, Maojie Zhang, Xia Guo, Xiaowei Zhan,

Yongfang Li*,  “Synthesis  and  photovoltaic  properties  of  copolymers  of  carbazole  and  

thiophene  with  conjugated  side  chain  containing  acceptor  end  groups”,  Polym. Chem., 2011, 2,

1678-1687.

53. Feiyao Qing, Yeping Sun, Xiaochen Wang, Na Li, Yongfang Li,* Xiaoyu Li* and Haiqiao  Wang*,  “A  novel  poly  (thienylenevinylene)  derivative  for  the  application   in  polymer  solar  cells”,  Polym. Chem., 2011, 2, 2102-2106.

54. Xiaochen Wang, Song Chen, Yeping Sun, Maojie Zhang, Yongfang Li*, Xiaoyu Li* and Haiqiao Wang*,  “A Furan-Bridged D-π-A Copolymer with Deep HOMO Level: Synthesis  and  Application  in  Polymer  Solar  Cells”,  Polym. Chem., 2011, 2, 2872-2877.

55. Maojie Zhang, Xia Guo, Yang Yang, Jing Zhang, Zhi-Guo Zhang and Yongfang Li*, “Downwards tuning HOMO level of polythiophene by carboxylate substitution for high open-circuit-voltage polymer solar cells”, Polym. Chem. 2011, 2, 2900-2906.

56. Zhenhua Zhang, Bo Peng, Bo Liu, Chunyue Pan, Yongfang Li,* Yuehui He, Kechao Zhou,

and  Yingping  Zou*,  “Copolymers  from  benzodithiophene and benzotriazole: synthesis and

photovoltaic  applications”,  Polym. Chem., 2010, 1, 1441-1447.

57. Kang Meng, Qing Ding, Shufeng Wang*, Youjun He, Yongfang Li*, Qihuang Gong*, "Spatial Conformation and Charge Recombination Properties of

Polythiophene Derivatives with Thienylene-vinylene Side-chains Investigated by Static and Femtosecond Spectroscopy", J. Phys. Chem. B, 2010, 114, 2602–2606.

58. He, Youjun; Zhang, Maojie; Min, Jie; Zhao, Guangjin; Li, Yongfang*, "Influence of sulfur oxidation on the absorption and electronic energy levels of poly (thienothiophene) derivatives", J. Phys. Chem. B, 2009, 113, 14981-14985.

59. Yu Huang, Ying Wang, Guangyi Sang, Erjun Zhou, Lijun Huo, Yunqi Liu*, Yongfang

Li*, “Polythiophene derivative with the simplest conjugated-side-chain of alkenyl: synthesis and application in polymer solar cells and field-effect transistors”, J Phys. Chem. B, 2008, 112, 13476-13482.

60. E.J. Zhou, Z.A. Tan, L.J. Huo, Y.J. He, C.H. Yang and Y.F. Li*, “Effect  of   two-dimensional conjugated structure on the optical, electrochemical, hole mobility  and  photovoltaic  properties  of  polythiophenes”, J. Phys. Chem. B. 2006, 110: 26062-26067.

61. Miao Yang, Bo Peng, Bo Liu, Yingping Zou*, Kechao Zhou, Yuehui He, Chunyue Pan,

Yongfang Li,*  “Synthesis and Photovoltaic Properties of Copolymers from

Benzodithiophene  and  Thiazole”,  J. Phys. Chem. C, 2010, 114, 17989–17994.

62. Guangyi Sang, Erjun Zhou, Yu Huang, Yingping Zou, Guangjin Zhao, Yongfang

Li*， “Incorporation of thienylenevinylene and triphenylamine moieties into polythiophene side chains for all-polymer photovoltaic applications”，J. Phys. Chem. C, 2009, 113, 5879-5885.

63. Sang, Guangyi; Zou, Yingping; Li, Yongfang*, "Two Polythiophene Derivatives Containing Phenothiazine Units: Synthesis and Photovoltaic Properties", J. Phys. Chem. C, 2008, 112: 12058-12064.

64. Qi Xu, Deping Qian, Fuzhi Wang, Liangjie Li , Shusheng Li, Xiaohe Tu, Gang Sun, Xuliang Hou, Jianhui Hou*, Yongfang Li*,  Zhan’ao  Tan,*, “Construction of Planar and Bulk Integrated Heterojunction Polymer Solar Cells using Cross-linkable D-A Copolymer”, ACS Appl. Mater. Interfaces, 2013, 5, 6591-6597.

65. Haijun Fan, Maojie Zhang, Xia Guo, Yongfang Li,*  Xiaowei  Zhan*,  “Evolved phase separation towards balanced charge transport and high efficiency in polymer solar cells”,  ACS Appl. Mater. Interfaces, 2011, 3, 3646–3653.

66. Youjun He, Xiang Wang, Jing Zhang, Yongfang Li*,  “Low  Bandgap  Polymers  by  

Copolymerization  of  Thiophene  with  Benzothiadiazole”,  Macromol. Rapid Commun. 2009,

30, 45–51.

67. Lijun Huo, Yi Zhou, Yongfang Li*,  “Synthesis,  characterization  and  photovoltaic  properties   of alkylthio-substituted  polythiophene”,  Macromol. Rapid Commun., 2009, 30, 925–931.

68. Lijun Huo, Yi Zhou, Yongfang Li*,   “Synthesis   and   Absorption   Spectra   of   Two   Novel n-type Conjugated Polymers Based on Perylene   Diimide”,   Macromol. Rapid Commun. 2008, 29, 1444-1448.

69. E.J. Zhou, Z.A. Tan, C.H. Yang, Y. F. Li*, “Linking polythiophene chains through conjugated bridges: a way to improve charge transport in polymer solar cells”, Macromol. Rapid Commun. 2006, 27: 793–798.

70. Ping Shen*, Xuewen Chen, Haijun Bin, Yongfang Li*, Side Chain Effect on Photovoltaic Properties of D-A Copolymers Based on Benzodithiophene and Thiophene-Substituted Bithiazole, Organic Electronics, 2013, 14(12), 3152-3162.

71. Xiaochen Wang, Chen Gao, Kai Wang, Xi Fan, Haiqiao Wang*, Xiaoyu Li*, Zhiguo Zhang* and Yongfang Li*,  “Synthesis and Electronic Energy Level Regulation of Imide-fused   Poly(Thienylene   Vinylene)   Derivatives”,   J. Polym. Sci. A: Polym. Chem., 2013, 51, 4975–4982.

72. Pei Jiang, Shaowei Shi, Song Chen, Xiaochen Wang, Haiqiao Wang*, Yongfang

Li* and Xiaoyu Li*, “Synthesis and Characterization of Porphyrin-Based D-π-A Conjugated   Polymers   for   Polymer   Solar   Cells”, J. Polym. Sci. A: Polym. Chem., 2013, 51, 2243–2251.

73. Haijun Fan, Zhiguo Zhang, Yongfang Li*,  Xiaowei  Zhan*,  “Two-dimensional

fluorene-based copolymers with  pendent  acceptors  for  solar  cells:  effect  of  side  chains”,  J.

Polym. Sci. A: Polym. Chem., 2011, 49, 1462-1470.

74. Maojie Zhang, Haijun Fan, Xia Guo, Yang Yang, Shanshan Wang, Zhi-Guo Zhang, Jing

Zhang, Xiaowei Zhan and Yongfang Li*,  “Synthesis  and  photovoltaic properties of

copolymers  based  on  bithiophene  and  bithiazole”  J. Polym. Sci. A: Polym. Chem. 2011, 49,

2746-2754.

75. Dugang Chen, Yang Yang, Cheng Zhong, Zhengran Yi, Fei Wu, Li Qu, Yu Li, Yongfang Li,* Jingui Qin*,  “Synthesis and photovoltaic properties of two-dimensional D-A copolymers with

conjugated  side  chains”,  J. Poly. Sci. A: Polym. Chem., 2011, 49, 3852-3862.

76. Youjun He, Yi Zhou*, Guangjin Zhao, Jie Min, Xia Guo, Bo Zhang, Maojie Zhang, Jing

Zhang, Yongfang Li*, Fengling Zhang, Olle Inganas,

“Poly(4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b’]  dithiophene  vinylene):    Synthesis,  Optical  

and  Photovoltaic  Properties”,  J. Polym. Sci. A: Polym. Chem. 2010, 48, 1822-1829. 77. Meixiu Wan, Weiping Wu, Guangyi Sang, Yingping Zou, Yunqi Liu* and Yongfang

Li*,  “Poly(thienylene-vinylene-thienylene) with Cyano Substituent: Synthesis and Application in Field-Effect  Transistor  and  Polymer  Solar  Cell”,  J. Polym. Sci. A: Polym. Chem. 2009，47, 4028–4036.

78. Youjun He, Weiping Wu, Yunqi Liu*, Yongfang Li*,  “High performance polymer field-effect transistors based on polythiophene derivative with conjugated side chain”，J. Polym. Sci. A: Polym. Chem., 2009, 47, 5304-5312.

79. Lijun Huo, Zhan’ao Tan, Xiang Wang, Yi Zhou, Erjun Zhou, Minfang Han, Yongfang Li*, “Novel two-dimensional donor-acceptor conjugated polymers containing quinoxaline units: synthesis, characterization and photovoltaic properties”, J. Polym. Sci. A: Polym. Chem., 2008, 46, 4038-4049.

80. E.J. Zhou, Z.A. Tan, Y.J. He, C.H. Yang, Y.F. Li*, “Synthesis, hole mobility and photovoltaic properties of two alternating poly(3-(hex-1-enyl)thiophene-co-thiophene)”, J. Polym. Sci. A: Polym. Chem., 2007，45: 629-638.

81. L.J. Huo, C. He, M.F. Han, E.J. Zhou, Y.F. Li*,  “Alternating  copolymers  of   electron-rich arylamine and electron-deficient 2,1,3-benzothiadiazole： Synthesis, Characterization and Photovoltaic  properties”,  J. Polym. Sci. A: Polym. Chem. 2007, 45: 3861-3871.

82. J.H. Hou, B.H. Fan, L.J. Huo, C. He, C.H. Yang, Y. F.

Li*，”Poly(alkylthio-p-phenylenevinylene): Synthesis, Electroluminescent and Photovoltaic Properties”, J Polym Sci. A Polym Chem, 2006, 44: 1279-1290.

83. E. J. Zhou, J. H. Hou, C. H. Yang, Y. F. Li*, “Synthesis and Characterization of a Novel Class of Polythiophenes with Conjugated Side-Chains Containing Carbon-Carbon Double or Triple Bonds”, J Polym Sci. A Polym Chem.，2006, 44: 2206-2214.

84. E.J. Zhou, C. He, Z.A. Tan, J.H.i Hou, C.H. Yang, Y.F. Li*，”Effect of side-chain end groups on the optical, electrochemical and photovoltaic properties of side-chain conjugated polythiophenes”，J. Polym. Sci. A: Polym. Chem. 2006, 44, 4916-4922

85. Maojie Zhang, Xia Guo, Zhi-Guo Zhang and Yongfang Li*, “D-A copolymers based on dithienosilole and phthalimide for photovoltaic materials”, Polymer, 2011, 52, 5464-5470.

86. Youjun He, Guangjin Zhao, Jie Min, Maojie Zhang, Yongfang Li*, “Poly(thienylene-benzothiodiazole-thienylene vinylene): a narrow bandgap polymer  with  broad  absorption  from  visible  to  infrared  region”, Polymer, 2009, 50, 5055-5058.

87. Guangyi Sang, Yingping Zou, Yu Huang, Guangjin Zhao, Yi Yang, Yongfang Li*， “All-polymer solar cells based on a blend of poly[3-(10-n-octyl-3- phenothiazine-vinylene)thiophene-co-2,5-thiophene] and poly[1,4-dioctyloxyl-p-2,5-dicyanophenylenevinylene]”，Appl. Phys. Lett. 2009, 94, 193302.

88. Zhan’ao Tan, Erjun Zhou, Xiaowei Zhan,* Xiang Wang, Yongfang Li*, Stephen Barlow, Seth R. Marder,* “Efficient All-Polymer Solar Cells based on Blend of Tris(thienylenevinylene)-Substituted Polythiophene and Poly(perylene diimide-alt-bis(dithienothiophene))”, Appl. Phys. Lett. 2008, 93, 073309.

89. Guangjin Zhao, Youjun He, Chang He, Haijun Fan, Yun Zhao, Yongfang Li*， “Photovoltaic  properties of poly(benzothiadiazole-thiophene-co-bithiophene) as donor in polymer solar cells”， Sol. Energy Mater. Sol. Cells, 2011, 95, 704–711.

90. C.H. Yang, H. Li, Q.J. Sun, J. Qiao, Y.L. Li, Y.F. Li*, D.B. Zhu, “Photovoltaic  Cells Based on the Blend of MEH-PPV and Polymers Containing C60 Moieties”, Solar Energy Materials & Solar Cells, 2005, 85, 241-249.

(2) Solution-processable organic molecule donor materials:

91. Huixia Shang, Haijun Fan, Yao Liu, Wenping Hu*, Yongfang Li,* and Xiaowei Zhan,*  “A  solution processable star-shaped molecule for high performance organic  solar  cells”，Adv. Mater., 2011, 23, 1554–1557.

92. Yuze Lin, Yongfang Li,* Xiaowei Zhan*,  “A  Solution-Processable Electron Acceptor  Based  on  Dibenzosilole  and  Diketopyrrolopyrrole”,  Adv. Energy Mater., 2013, 3, 724-728.

93. Qinqin Shi, Pei Cheng, Yongfang Li* and Xiaowei Zhan*,  “A  Solution  Processable   D-A-D Molecule based on Thiazolothiazole for High Performance Organic Solar Cells”,  Adv. Energy Mater., 2012, 2, 63–67.

94. Suling Shen, Pei Jiang, Chang He*, Jing Zhang, Ping Shen, Yuanping Yi*, Zhanjun Zhang, Zhibo Li, Yongfang Li*,  “Solution-processable organic molecule photovoltaic materials with bithienyl-benzodithiophene central unit and indenedione  end  groups”,  Chem. Mater. 2013, 25, 2274-2281.

95. Jing Zhang, Dan Deng, Chang He*, Youjun He, Maojie Zhang, Zhi-Guo Zhang, Zhanjun Zhang, Yongfang Li*,  “Star-Shaped Molecules with Triphenylamine core and Dicyanovinyl End-groups  for  Organic  Solar  Cells”,  Chem. Mater., 2011, 23, 817-822.

96. Yuze Lin, Zhi-Guo Zhang, Huitao Bai, Yongfang Li,* Xiaowei Zhan*, “A   star-shaped oligothiophene end-capped with alkyl cyanoacetate group for solution-processed  organic  solar  cells”, Chem. Commun, 2012, 48, 9655-9657.

97. Jing Zhang, Yi Yang, Chang He, Youjun He, Guangjin Zhao, Yongfang Li*, “Solution-Processable Star-Shaped Photovoltaic Organic Molecule with Triphenylamine Core and Benzothiadiazole-Thiophene Arms”, Macromolecules, 2009, 42, 7619-7622.

98. Jing Zhang, Guanglong Wu, Chang He*, Dan Deng, Yongfang Li*, “Triphenylamine-containing D-A-D molecules with (dicyanomethylene)pyran as acceptor unit for bulk-heterojunction  organic  solar  cells”,  J. Mater. Chem., 2011, 21, 3768-3774.

99. Huixia Shang, Haijun Fan, Yao Liu, Wenping Hu,* Yongfang Li,* and Xiaowei Zhan*,  “New  X-shaped oligothiophenes for solution-processed  solar  cells”, J. Mater. Chem. 2011, 21, 9667-9673.

100. Chang He, Qingguo He, Yuanping Yi, Guanglong Wu, Fenglian Bai, Zhigang Shuai, Yongfang Li*,  “Improve  the  efficiency  of  solution  processable  organic  

photovoltaic devices by a star-shaped  molecular  geometry”,  J. Mater. Chem. 2008, 18, 4085-4090.

101. Yi Yang, Jing Zhang, Yi Zhou*, Guangjin Zhao, Chang He, Yongfang Li*, Olle Inganäs,  Fengling  Zhang,  “Solution-processable organic molecule with triphenylamine core and two benzothiadiazole-thiophene arms for photovoltaic application”, J. Phys. Chem. C, 2010, 114, 3701-3706.

102. Guangjin Zhao, Guanglong Wu, Chang He, Fu-Quan Bai, Hongxia Xi, Hong-Xing Zhang, Yongfang Li*, “Solution-Processable Multi-armed Organic Molecules Containing Triphenylamine and DCM Moieties: Synthesis and Photovoltaic Properties”, J. Phys. Chem. C , 2009, 113, 2636-2642.

103. Guangjin Zhao, Guanglong Wu, Chang He, Fu-Quan Bai, Hongxia Xi, Hong-Xing Zhang, Yongfang Li*, “Solution-Processable Multi-armed Organic Molecules Containing Triphenylamine and DCM Moieties: Synthesis and Photovoltaic Properties”, J Phys. Chem. C 2009, 113, 2636-2642.

104. C. He , Q.G. He, X.D. Yang, G.L. Wu, C.H. Yang, F.L. Bai*, Z.G. Shuai, L. Wang, Y. F.

Li*, “Synthesis and photovoltaic properties of a solution-processible organic molecule containing triphenylamine and DCM moieties”, J. Phys. Chem. C, 2007, 111: 8661-8666.

105. Haijun Fan, Huixia Shang, Yongfang Li, and Xiaowei Zhan*, “Efficiency enhancement in small molecule bulk heterojunction organic solar cells via additive”, Appl. Phys. Lett. 2010, 97, 133302.

106. Suling Shen, Lei Gao, Chang He*, Zhanjun Zhang*, Qingjiang Sun, Yongfang Li*, “A  star-shaped oligothiophene with triphenylamine as core and octyl cyanoacetate as end groups for solution-processed  organic  solar  cells”,  Organic Electronics 2013, 14, 875-881.

107. Jing Zhang, Jintao Yu, Chang He*, Dan Deng, Zhi-Guo Zhang, Maojie Zhang, Zhibo Li, Yongfang Li*,  “Solution-processable Star-Shaped Photovoltaic Organic Molecules with Longer pi-Bridge”,  Organic Electronics, 2012, 13, 166-172.

108. Dan Deng, Suling Shen, Jing Zhang, Chang He*, Zhanjun Zhang*, Yongfang Li*, “Solution-processable star-shaped photovoltaic organic molecules with triphenylamine core and thieno[3,2-b]thiophene -dicyanovinyl  arms”,  Organic Electronics，2012, 13, 2546–2552.

109. Dan Deng, Yang Yang, Jing Zhang, Chang He, Maojie Zhang, Zhi-Guo Zhang, Zhanjun Zhang*, Yongfang Li*,  “Triphenylamine-containing linear D-A-D molecules with benzothiadiazole as acceptor unit for bulk-heterojunction organic  solar  cells”,  Org. Electron. 2011, 12, 614-622.

110. Huixia Shang, Haijun Fan, Qinqin Shi, Shuo Li, Yongfang Li, Xiaowei Zhan*, “Solution  processable  D-A-D molecules based on triphenylamine for efficient organic  solar  cells”, Sol. Energy Mater. Sol. Cells, 2010, 94: 457–464.

111. Guanglong Wu, Guangjin Zhao, Chang He, Jing Zhang, Qingguo He, Xiaomin Chen and Yongfang Li*,  “Synthesis  and  photovoltaic  properties  of  a  star-shaped molecule with triphenylamine as core and benzo[1,2,5]thiadiazol vinylene as arms”, Solar Energy Mater. Solar Cells., 2009, 93, 108-113.

112. C. He, Q.G. He, Y.J. He, Y.F. Li*, F.L. Bai*, C.H. Yang, Y.Q. Ding, L.X. Wang, J.P. Ye, “Organic Solar cells based on the spin-coated blend films of TPA-th-TPA and PCBM”, Solar Energy Materials & Solar Cells，2006, 90: 1815-1827.

(3) Fullerene derivative acceptor materials:

113. Youjun He, Hsiang-Yu Chen, Jianhui Hou*, Yongfang Li*，”Indene-C60 bisadduct: a new  acceptor  for  high  performance  polymer  solar  cells”,  J. Am. Chem. Soc., 2010, 132, 1377-1382.

114. Yen-Ju Cheng*, Chao-Hsiang Hsieh, Youjun He, Chain-Shu Hsu*, Yongfang Li*, ”   Combination of indene-C60 bis-adduct and cross-linked fullerence interlayer leading to highly efficient inverted polymer solar  cells”, J. Am. Chem. Soc. 2010, 132, 17381–17383.

115. Chih-Yu Chang, Cheng-En Wu, Chaohua Cui, Shih-Yung Chen, Yen-Ju Cheng, Chain-Shu Hsu*, Yuh-Lin Wang,* and Yongfang Li,  “Enhanced  Performance  and   Stability of Polymer Solar Cells by Incorporating Cross-Linked Fullerene Nanorods”, Angew. Chem. Int. Ed., 2011, 50, 9386-9390.

116. Jun Yang*, Rui Zhu, Ziruo Hong, Youjun He, Ankit Kumar, Yongfang Li, and Yang Yang*,  “Achieving  high  performance  tandem  polymer  solar  cells”, Adv. Mater. 2011, 23, 3465–3470.

117. Guangjin Zhao, Youjun He, Yongfang Li*,  “6.5%  Efficiency  of  the  polymer  solar cells based on poly(3-hexylthiophene) and indene-C60 bisadduct by device optimization”,  Adv. Mater. , 2010, 22, 4355-4358.

118. Guangjin Zhao, Youjun He, Zheng Xu, Jianhui Hou*, Maojie Zhang, Jie Min, Hsiang-Yu Chen, Mingfu Ye, Ziruo Hong, Yang Yang*, Yongfang Li*,  “Effect  of   carbon chain length in the substituent of PCBM-like molecules on their photovoltaic  properties”  ,  Adv. Funct. Mater. 2010, 20, 1480-1487.

119. Youjun He, Guangjin Zhao, Bo Peng, Yongfang Li*，“High  yield  synthesis,   electrochemical and photovoltaic properties of indene-C70 bisadduct”，Adv. Funct. Mater., 2010, 20, 3383-3389.

120. Xiangyue Meng, Wenqing Zhang, Zhan’ao  Tan,* Yongfang Li, Yihan Ma, Taishan Wang, Li Jiang, Chunying Shu, and Chunru  Wang*,  “Highly Efficient and

Thermally Stable Polymer Solar Cells with Dihydronaphthyl-Based [70]Fullerene Bisadduct  Derivative  as  Acceptor”, Adv. Funct. Mater., 2012, 22, 2187–2193.

121. Xiangyue Meng, Guangyao Zhao, Qi Xu, Zhan’ao  Tan, Zhuxia Zhang, Li Jiang, Chunying Shu, Chunru Wang* and Yongfang Li*,  “Effects  of  fullerene  bisadduct   regioisomers  on  photovoltaic  performance”, Adv. Funct. Mater. 2014, 24, 158-163.

122. Yeping Sun, Chaohua Cui, Haiqiao Wang, Yongfang Li*,  “High  Efficiency  Polymer   Solar Cells Based On Poly(3-pentylthiophene) with Indene-C70 Bisadduct as an Acceptor”  ,  Adv. Energy Mater. 2012, 2, 966–969.

123. Yeping Sun, Chaohua Cui, Haiqiao Wang, Yongfang Li*, “Efficiency  enhancement of polymer solar cells based on poly(3-hexylthiophene)/indene-C70 bisadduct via methylthiophene additive”, Adv. Energy Mater. 2011, 1, 1058-1061.

124. Xia Guo, Chaohua Cui, Maojie Zhang, Lijun Huo, Ye Huang, Jianhui Hou*, Yongfang Li*, “High efficiency polymer solar cells based on poly(3-hexylthiophene)/indene-C70 bisadduct with solution additive”, Energy Environ. Sci. 2012, 5, 7943-7949.

125. Xiangyue Meng, Wenqing Zhang, Zhanao Tan, Chun Du, Cuihong Li, Zhishan Bo, Yongfang Li,* Taishan Wang, Li Jiang, Chunying Shu,* and Chunru Wang*, “Dihydronaphthyl-Based [60]Fullerene Bisadducts for Efficient and Stable Polymer Solar  Cells”,  Chem. Commun., 2012, 48, 425–427.

126. Juan Liu, Xia Guo,Yujun Qin*, Shengde Liang, Zhi-Xin Guo and Yongfang Li*, “Dumb-belled  PCBM  derivative  with  better  photovoltaic  performance”, J. Mater. Chem., 2012, 22, 1758-1761.

127. Youjun He, Bo Peng, Guangjin Zhao, Yingping Zou, Yongfang Li*,  “Indene   addition of [6, 6]-phenyl-C61-butyric acid methyl ester for high performance acceptor  in  polymer  solar  cells”,  J. Phys. Chem. C, 2011, 115, 4340–4344.

128. Youjun He, Hsiang-Yu Chen, Guangjin Zhao, Jianhui Hou*, and Yongfang Li*, “Biindene-C60 adducts for the application as acceptor in polymer solar cells with higher open-circuit-voltage”, Sol. Energy Mater. Sol. Cells, 2011, 95, 899-903.

129. Youjun He, Hsiang-Yu Chen, Guangjin Zhao, Jianhui Hou*, Yongfang Li*, “Synthesis  and  photovoltaic  properties  of  biindene-C70 monoadduct as acceptor in  polymer  solar  cells”,  Solar Energy Materials & Solar Cells, 2011, 95, 1762–1766.

(4) Electrode buffer layer materials and new device structures of polymer solar

cells:

130. Menglan Lv, Shusheng Li, Jacek Jasieniak, Jianhui Hou, Scott E. Watkins, Jin Zhu,* Zhan’ao  Tan*, Yongfang  Li,*    Xiwen  Chen*,  “Hyperbranched  Conjugated  Polymer  

as Cathode Interlayer for High Performance Polymer Solar  Cells”,  Adv. Mater., 2013, 25, 6889–6894.

131. Zhan’ao  Tan*,  Wenqing  Zhang,  Ye  Huang,  Zhiguo  Zhang,  Deping  Qian,  Jianhui   Hou*, Yongfang Li*,  “High  performance  inverted  polymer  solar  cells  with   solution-processed titanium chelate as electron-collecting layer on ITO electrode”,  Adv. Mater. 2012, 24, 1476-1481.

132. Xuanhua Li, Wallace C.H. Choy,* Lijun Huo, Fengxian Xie, Wei E.I. Sha, Baofu Ding, Xia Guo, Yongfang Li, Jianhui Hou*, Jingbi You, Yang Yang, “Dual  Plasmonic   Nanostructures for High Performance Inverted  Organic  Solar  Cells”, Adv. Mater., 2012, 24, 3046–3052.

133. Xi Fan, Chaohua Cui, Guojia Fang*, Jinzhao Wang, Songzhan Li, Fei Cheng, Hao Long, Yongfang Li*,  “Efficient polymer solar cells based on poly(3-hexylthiophene):indene-C70 bisadduct with MoO3 buffer layer”,  Adv. Funct. Mater. 2012, 22, 585–590.

134. Shusheng Li, Ming Lei*, Menglan  Lv,  Scott  E.  Watkins,  Zhan’ao  Tan*, Jin Zhu, Jianhui Hou, Xiwen Chen* and Yongfang Li*,  “[6,6]-Phenyl-C61- Butyric Acid Dimethylamino Ester as Cathode Buffer Layer for High Performance Polymer Solar  Cells”,  Adv. Energy Mater. 2013, 3, 1569–1574.

135. Zhan’ao  Tan*, Liangjie Li, Fuzhi Wang, Qi Xu, Shusheng Li, Gang Sun, Xiaohe Tu, Xuliang Hou, Jianhui Hou*, Yongfang Li*,  “Solution-processed rhenium oxide, a versatile anode buffer layer for high performance polymer solar cells with enhanced  light  harvest”,  Adv. Energy Mater. 2014, 4, No. 1300884.

136. Fuzhi  Wang,  Qi  Xu,  Zhan’ao  Tan*, Liangjie Li, Shusheng Li, Xuliang Hou, Gang Sun, Xiaohe Tu, Jianhui Hou, Yongfang Li*, “Efficient Polymer Solar Cells with a Solution-Processed and thermal-annealing-free RuO2 Anode Buffer Layer”, J. Mater. Chem. A, 2014. 2, 1318-1324.

137. Zhan’ao  Tan,*  Deping  Qian,  Wenqing  Zhang, Liangjie Li, Yuqin Ding, Qi Xu, Fuzhi Wang, Yongfang Li*,  “Efficient  and stable polymer solar cells with solution-processed  molybdenum  oxide  interfacial  layer”,  J. Mater. Chem. A, 2013, 1, 657–664.

138. Zhi-Guo Zhang*, Hui Li, Boyuan Qi, Zhiwen Jin, Zhe Qi, Dan Chi, Jianhui Hou*, Yongfang Li*, and Jizheng  Wang*,  “Amine  Groups  Covered Fullerene Derivative as  Electron  Buffer  Layer  for  High  Performance  Polymer  Solar  Cells”,  J. Mater.

Chem. A, 2013, 1, 9624-9629. 139. Qi  Xu,  Fuzhi  Wang,  Zhan’ao  Tan*,  Liangjie  Li,  Shusheng  Li,  Xuliang  Hou,  Gang  Sun,  

Xiaohe Tu, Jianhui Hou*, Yongfang Li*, High-performance polymer solar cells with solution-processed and environment friendly CuOx anode buffer layer, ACS Appl. Mater. Interfaces, 2013, 5, 10658–10664.

140. Yajie Zhang, Jin Fang, Chang He, Han Yan, Zhixiang Wei* and Yongfang Li,  “An integrated energy harvesting system by combining the advantages of polymer solar cells and thermoelectric devices”, J. Phys. Chem. C, 2013, 117, 24685–24691.

141. Zhan’ao  Tan*, Liangjie Li, Chaohua Cui, Yuqin Ding, Qi Xu, Shusheng Li, Deping Qian, Yongfang Li*,  “Solution-processed tungsten oxide as an effective anode interfacial  buffer  layer  for  high  performance  polymer  solar  cells”,  J. Phys. Chem. C, 2012, 116, 18626-18632.

142. Zhan’ao  Tan*, Wenqing Zhang, Deping Qian, Chaohua Cui, Qi Xu, Liangjie Li, Shusheng Li, and Yongfang Li*,  “Solution-processed nickel acetate as hole collection  layer  for  polymer  solar  cells”, Phys. Chem. Chem. Phys. 2012, 14, 14217-14223.

143. Zhan’ao  Tan,*  Wenqing  Zhang,  Chaohua  Cui, Yuqin Ding, Deping Qian, Qi Xu, Liangjie Li, Shusheng Li, and Yongfang Li,* “Solution-processed vanadium oxide as hole collection layer on ITO electrode for high-performance polymer solar cells”,  Phys. Chem. Chem. Phys., 2012, 14, 14589-14595.

144. Zhi-Guo Zhang, Hui Li, Zhe Qi, Zhiwen Jin, Guo Liu, Jianhui Hou*, Yongfang Li*, and  Jizheng  Wang*,  “Poly(ethylene  glycol)  modified  [60]fullerene  as  electron   buffer layer for high-performance  polymer  solar  cells”, Appl. Phys. Lett., 2013, 102, Art. No. 143902

145. Hui Li, Yongfang Li*, and Jizheng Wang*,  “Optimizing performance of layer-by-layer  processed  polymer  solar  cells”, Appl. Phys. Lett., 2012, 101, 033907.

146. Hui Li, Zhi-guo Zhang,Yongfang Li,  Jizheng  Wang*,  “Tunable open-circuit voltage in  ternary  organic  solar  cells”,  Appl. Phys. Lett., 2012, 101, 163302.

147. Fuzhi Wang, Qi Xu,  Zhan’ao  Tan*,  Deping  Qian,  Yuqin  Ding,  Liangjie  Li,  Shusheng   Li, Yongfang Li*, “Alcohol soluble titanium(IV) oxide bis(2,4-pentanedionate) as electron  collection  layer  for  efficient  inverted  polymer  solar  cells”,  Organic Electronics, 2012, 13, 2429-2435.

148. Bo Peng, Xia Guo, Chaohua Cui, Yingping Zou, Chunyue Pan, Yongfang Li*, “Performance improvement of P3HT:PCBM-based polymer solar cells by using an organic solvent-treated PEDOT:PSS modification layer”, Appl. Phys. Lett. 2011, 98, 243308.

149. Z.A. Tan, C.H. Yang, E.J. Zhou, X. Wang, Y.F. Li*, “Performance  improvement  of   polymer solar cells by using a solution processible titanium chelate as cathode buffer  layer”  Appl. Phys. Lett., 2007, 91: 023509.

(5) Semiconductor nanocrystals and related optoelectronics devices:

150. Q.J. Sun, Y. A. Wang*, L. S. Li, D.Y. Wang, T. Zhu, J. Xu, C.H. Yang, Y.F. Li*, “Bright, Multicoloured Light Emitting Diodes Based on Quantum Dots”, Nature Photonics, 2007, 1: 717-722.

151. Feng Jiang, Jinjin Liu, Yunchao Li*, Louzhen Fan, Yuqin Ding, Yongfang Li*, “Ultralong  CdTe  nanowires:  catalyst-free synthesis and high-yield transformation into core-shell  heterostructures”,  Adv. Funct. Mater., 2012, 22, 2402–2411

152. Bingkun Chen, Haizheng Zhong,* Wenqing Zhang, Zhanao Tan,* Yongfang Li, Cairan  Yu,  Tianyou  Zhai,  Yoshio  Bando,  Shengyi  Yang  and  Bingsuo  Zou,  “Highly   Emissive and Color-Tunable CuInS2 based Colloidal Semiconductor Nanocrystals: Off-Stoichiometry Effects and Improved Electroluminescence  Performance”,  Adv. Funct. Mater., 2012, 22, 2081–2088.

153. Y.C. Li, H.Z. Zhong, R. Li, Y. Zhou, C.H. Yang, Y.F. Li*, “High-yield fabrication and electrochemical characterization of tetrapod-shaped CdSe, CdTe and CdSexTe1-x nanocrystals”, Adv. Funct. Mater., 2006, 16: 1705-1716.

154. Y.C. Li, M.F. Ye, C.H. Yang, X.H. Li, Y.F. Li*, “Composition- and shape-controlled synthesis and optical properties of ZnxCd1-xS alloyed nanocrystals”, Adv. Funct. Mater. 2005, 15, 433-441.

155. Feng Jiang, Yunchao Li*, Mingfu Ye, Louzhen Fan, Yuqin Ding and Yongfang Li*, “Ligand-tuned shape control, oriented assembly and electrochemical characterization of colloidal ZnTe nanocrystals”, Chem. Mater., 2010, 22, 4632–4641.

156. Haizheng Zhong, Yi Zhou, Mingfu Ye, Xiang Wang, Youjun He, Jianping Ye, Chang He, Chunhe Yang, Yongfang Li*, “Controlled Synthesis and Optical Properties of Colloidal Ternary Chalcogenide CuInS2 Nanocrystals”, Chem. Mater. 2008, 20, 6434-6443.

157. Yang Yang, Haizheng Zhong,* Zelong Bai, Yongfang Li,* Bingsuo Zou, Gregory D. Scholes, “Photoconductivity and Photovoltaic Behaviors of Hybrid P3HT and CuInSe2 Nanocrystals  Composites”,  J. Phys. Chem. C, 2012, 116, 7280–7286.

158. H. Z. Zhong, Y. Zhou, Y. Yang, C. H. Yang, Y. F. Li*, “Synthesis of Type II CdTe-CdSe Nanocrystal Heterostructured Multiple-branched Rods and Their Photovoltaic Applications”, J Phys Chem C，2007, 111, 6538-6543.

159. Y. C. Li, X. H. Li, C. H. Yang, Y. F. Li*, “Ligand-controlling synthesis and ordered assembly of ZnS nanorods and nanodots”, J. Phys. Chem. B, 2004, 108(41): 16002-16011.

160. Y. C. Li, X. H. Li, C. H. Yang, Y. F. Li*, “Controlled Synthesis of CdS nanorods and hexagonal nanocrystals”, J. Mater. Chem., 2003, 13, 2641 – 2648

161. H. Z. Zhong, Z. X. Wei, M. F. Ye, Y. Yan, Y. Zhou, Y. Q. Ding, C. H. Yang, Y. F. Li*, “Monodispersed ZnSe Microspheres and Their 2D Arrays: preparation and characterization”, Langmuir, 2007, 23: 9008-9013.

162. M. F. Ye, H. Z. Zhong, W. Zheng, C. H. Yang, Y. F. Li*, “Ultralong cadmium hydroxide nanowires: synthesis, characterization and transformation into CdO nanostrands”, Langmuir, 2007, 23: 9064-9068.

163. Y. H. Ma, F. Z. Liu,* M. F. Zhu, J. L. Liu, H.-H. Wang，Y. Yang, Y. F. Li，”Aligned amorphous and microcrystalline Si nanorods by Glancing-Angle Deposition at Low-Temperature”, Nanotechnology, 2009, 20, Art. No. 275201.

164. Haizheng Zhong, Yong Sheng Zhao, Yongfang Li, Qibing Pei*，“Bismuth Iodide and Conjugated Polymer Composites for Gamma Ray Detection”， Nanotechnology, 2008, 19, 505503.

165. H.Z. Zhong, Y.C. Li, M.F. Ye, Z. Zhu, Y. Zhou, C.H. Yang, Y. F. Li*, “A new facile route to synthesize Chalcopyrite CuInSe2 Nanocrystals in Non-coordinating Solvent”, Nanotechnology, 2007, 18, 025602.

166. H.Z. Zhong, Y.C. Li, Y. Zhou, C.H. Yang, Y.F. Li*, “Controllable synthesis of 3D nanostructured Cd4Cl3(OH)5 templates and their transformation into Cd(OH)2 and CdS nanostructures”, Nanotechnology. 2006, 17: 772-777.

167. Y. Zhou, Y.C. Li, H.Z. Zhong, J.H. Hou, Y.Q. Ding, C.H. Yang, Y.F. Li*, “Hybrid nanocrystal-polymer solar cells based on tetrapod-shaped CdSexTe1-x, nanocrystals”, Nanotechnology, 2006, 17: 4041-4047.

(6) Electrochemistry of conducting polymers and polymer light-emitting

electrochemical cells:

168. Chunhe Yang, Qingjiang Sun, Jing Qiao, Yongfang Li,* “Ionic liquid Doped Polymer Light-emitting Electrochemical Cells”, J. Phys. Chem. B. 2003, 107, 12981-12988.

169. Qingjiang Sun, Haiqiao Wang, Chunhe Yang, Yongfang Li,* “Synthesis and electroluminescence of novel block copolymers containing crown ether spacers”， J. Mater. Chem., 2003, 13, 800-806.

170. Jianyong Ouyang, Yongfang Li*, “Effect  of  electrolyte  solvent  on  the  conductivity   and structure of as-prepared  polypyrrole  films”, Polymer, 1997, 38, 1971

171. Jianyong Ouyang, Yongfang Li*, “Great   improvement   of   polypyrrole films prepared electrochemically from aqueous solutions by adding nonaphenol polyethyleneoxy(10)  ether”, Polymer, 1997, 38, 3997

172. Y. F. Li, R. Y.   Qian,   “Electrochemical   over-oxidation of conducting polypyrrole nitrate  film  in  aqueous  solution”,  Electrochim. Acta, 2000, 45, 1727-1731.

173. Yongfang Li, “On   the   large   overpotential   of   the   first   reduction   of   polypyrrole  

perchlorate  films  in  organic  solutions”, Electrochimica Acta, 1997, 42, 203 174. C. H. Yang, G. F. He, R. Q. Wang, Y. F. Li*,“Solid state electrochemical

investigation of poly[2-methoxy,5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene]”， J. Electroanal. Chem., 1999, 471, 32-36.

175. Yongfang Li, “Effect   of   anion   concentration   on   the   kinetics   of   electrochemical   polymerization  of  pyrrole”, J. Electroanal. Chem., 1997, 433, 181

176. Peng Wang, Yongfang Li*, “Electrochemical   and   electrocatalytic   properties   of   polypyrrole  film  doped  with  heteropolyanions”, J. Electroanal. Chem., 1996, 408, 77

177. Yongfang Li, Renyuan Qian, “On   the   nature   of   redox   processes   in   the   cyclic voltammetry  of  polypyrrole  in  aqueous  solutions”， J. Electroanal. Chem., 1993,

362, 267. 178. G. Yu, Y. Cao, C. Zhang, Y.F. Li, J. Gao, A.J. Heeger，“Complex   admittance  

measurements of polymer light-emitting electrochemical cells: ionic and electronic

contributions”， Appl. Phys. Lett., 1998, 73, 113

179. Y. F. Li, J. Gao, G. Yu, Y. Cao, A. J. Heeger，“AC impedance of polymer

light-emitting electrochemical cells and light-emitting diode: a comparative study”， Chem. Phys. Lett., 1998, 287, 83

180. Qingjiang Sun, Haiqiao Wang, Chunhe Yang, Yongfang Li*, “Polymer light-emitting electrochemical cell based on a novel block copolymer containing tri(ethylene oxide) spacers”, Synth. Met., 2003, 137, 1087-1088.

181. Qingjiang Sun, Chunhe Yang, Gufeng He, Yongfang Li*,   “Effects   of   electrode   modifications on the performance of polymer light-emitting electrochemical cells”, Synth. Met., 2003, 138, 561-565.

182. Qingjiang Sun, Qingguo He, Chunhe Yang, Fenglian Bai, Yongfang Li*, “Photo- and Electro-luminescence from Hyperbranched Phenylene Vinylenes”, Synth. Met., 2003, 139，417-423.

183. Xiaohong Li, Yongfang Li*,“Electropolymerization of thiophene in Acetonitrile with boron trifluoride-ethyl ether as supporting electrolyte”， Synth. Met., 2003, 137, 215-216.

184. Chang He, Yongfang Li*, “Chemical Synthesis of Coral-like Nanowires and Nanowire Networks of Conducting Polypyrrole”, Synth. Met., 2003, 139, 539-545.

185. Yongfang Li*, Jianyong Ouyang, “Effect  of  nonionic   surfactant  additives  on   the   electropolymerization  of  pyrrole   in  aqueous  solutions”, Synth. Met., 2000, 113, 23-28

186. Y.F. Li, Y. Cao, J. Gao, D.L. Wang, G. Yu, A.J. Heeger，“Electrochemical properties of luminescent polymers and polymer light-emitting electrochemical cells”,

Synth. Met., 1999, 99, 243-248 187. Yongfang Li, Zhongfan Liu, “Electrochemical   quartz crystal microbalance

studies on the two reduction processes of conducting polypyrrole nitrate films in aqueous  solutions”, Synth. Met., 1998, 94, 131

188. Yongfang Li, Gufeng He, “Effect of preparation condition on the two doping structures  of  polypyrrole”, Synth. Met., 1998, 94, 127

189. Y.F. Li, J. Gao, D.L. Wang, G. Yu, Y. Cao, A.J. Heeger，“AC impedance of frozen junction polymer light-emitting electrochemical cells”, Synth. Met., 1998, 97, 191-194

190. Jianyong Ouyang, Yongfang Li*, “Preparation   and   characterization   of   flexible   polypyrrole  nitrate  films”, Synth. Met., 1996, 79, 121

191. Yongfang Li, Yongfa Fan, “Doping   competition   of   anions   during   the   electropolymerization   of   pyrrole   in   aqueous   solutions”, Synth. Met., 1996, 79, 225

192. Yongfang Li*, Jianyong Ouyang, Jing Yang“Two doping structures and structural anisotropy revealed by the mass loss and shrinkage of polypyrrole films on alkali treatment”, Synth. Met., 1995, 74, 49.

193. Jianyong Ouyang, Yongfang Li*, “Enhancemant of the electrical conductivity of polypyrrole films on applying higher voltage”, Synth. Met., 1995, 75, 1

194. Yongfang Li, Renyuan Qian, “Studies  on  the  electrode  kinetics  of  polypyrrole  in   aqueous  solutions  by  ac  impedance  measurement”, Synth. Met., 1994, 64, 241.

195. Yongfang Li, Renyuan Qian, “Stability of conducting polymers from the electrochemical point of view”， Synth. Met., 1993, 53, 149

196. Yongfang Li, Renyuan Qian, “ Inductance effect in the ac impedance of conducting polypyrrole films”, Synth. Met., 1993, 55-57, 3637.

197. Yongfang Li, Renyuan Qian, “Effect of anion and solution pH on the electrochemical behavior of polypyrrole in aqueous solution”, Synth. Met., 1989, 28, c127

198. Yongfang Li, Renyuan Qian, “Studies on the compensation of conducting polypyrrole by NaOH solution”， Synth. Met., 1988, 26, 139

199. Yongfang Li, Baozhen Yan, Jing Yang, Yong Cao, Renyuan Qian, “Spectroelectrochemical studies of polyaniline”, Synth. Met., 1988, 25, 79

200. Yongfang Li, Renyuan Qian, K.Imaeda, H. Inokuchi, “Behavior  of   the high temperature conductivity  of  polypyrrole  nitrate  films”, Polymer Journal, 26(1994) 53