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Materials, Mechanism and Device ofDye-sensitized Solar Cell

Tsinghua University

Hong Lin

hong-lin@tsinghua.edu.cn

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2010 (Forecast)

Jp 1.200EU 1.000US 500SOA 500

ROW 500

3.700

MW GW30%p.a. 25%p.a.

Courtesy Dr. Winfried Hoffman, CEO, RWE, SCHOTT Solar GmbH

0

500

1000

1500

2000

2500

3000

3500

0

20

40

60

80

100

120

140

c-Si

thin film

"New Concepts"

c-Si 430 950 3340

thin film 20 50 290

"New Concepts" 70

c-Si 9 24 56 114

thin film 2 8 36 133"New Concepts" 1 3 20 133

2002 2005 2010 2015 2020 2025 2030

Production Forecast of Solar ModulesUsing Different Technologies

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Low cost

Easy process

High theoretical

efficiency

Dye-sensitizedSolar Cell (DSC)

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Key issues for DSC

Electron Transport MechanismElectron generationElectron transport

Electron recombinationMaterial Design and SynthesisDesigned for improving electron generation and

transport, but retarding recombination

Assembling Technique for Large-area Celland ModuleScreen printing techniqueSealing technique

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Electron generationSurface area

Dye absorption

Electron transportPorosity

Diffusion coefficient

Electron recombinationPore size

Recombination resistance

Scientific issues for DSC

Jsc=Jinj -Jloss

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Mechanism of Electron Transport

Numerical simulation combining with experiments Structural modeling

Electrochemical modeling

Promoting electron transport, especially retarding recombinationwas found to be important for Jsc

J. Phys. Chem. C, 112, 1374413753 (2008)

J. Photochem. Photobio.,A., 195, 247253 (2008)

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Promoting Electron Transport

Nanowire array gave higher photocurrent than P25nanoparticles, by providing nano-channel forelectrons

J. Am. Ceram. Soc., 91 (2) 628631 (2008)

500nm 100nm

(a

)

(b

)

(c

)

(d

)

10n

m

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Promoting Electron Transport

Composite electrolyte with layered inorganic materialincreased ionic diffusion coefficient largely, byproviding nano-channel for I

3-

Electrochem. Commun., 8, 946950 (2006)

Appl. Phys. Lett., 89(19): 194104-194106, (2006)

e-

-ZrPwt%

I0

mA/cm2

10-7cm2/s

0 0.339 1.083 0.541 1.55

6 1.02 2.89

9 0.698 2.60

12 0.613 2.38

3I

D

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Retarding electron recombination

Co-adsorbent can retard the electron recombination DINHOP

found by our student during his co-research in Prof. Graetzels lab

with high efficiency and long lifetime

Chem. Lett. 38 (4), 322-323. (2009) Dalton Trans., in press, cooperated with Prof. Graetzel

No. Dye toDINHOP

Jsc

(mA cm-2)

Voc

(mV)

FF

(%)

r 0 14.8 724 0.675 7.24

s 4:1 15.5 752 0.670 7.79

t 2:1 14.6 754 0.700 7.75

u 1:1 14.8 763 0.700 7.91

v 1:2 14.2 749 0.702 7.50

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Screen printing technique for all materials

Sealing technique for durability testing

Assembling Technology

ParallelW-typeseries

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Cell and Module

30 cm * 40 cm

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Improving electron transport and retardingelectron recombination are very important forincreasing efficiency

Low-dimensional materials are positive for chargetransport

Assembling technique for solar module are stillneeded to be improved

Summary

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Acknowledgement

National Natural Science Foundation of China

(NSFC, 50672041)

The National High Technology Research and

Development Program of China

(863 Program, 2006AA03Z218)

Beijing Natural Science Foundation

(2062013)

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Acknowledgement

Prof. Jianbao LiDr. candidate:

X. Li, JZ Liu

H. Hao, XC Zhao

J. Wu, JF LiMaster candidate:

WL Wang

DT Zhuang

CJ Liu, J ZhangLH Liu

SRT students

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Thank you for your attention!

Acknowledgement