Roll-to-Roll Fabrication Technology for Organic Semiconductors Jae Young Choi Nov. 13, 2007.
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Transcript of Roll-to-Roll Fabrication Technology for Organic Semiconductors Jae Young Choi Nov. 13, 2007.
![Page 1: Roll-to-Roll Fabrication Technology for Organic Semiconductors Jae Young Choi Nov. 13, 2007.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfc21a28abf838ca4e2d/html5/thumbnails/1.jpg)
Roll-to-Roll Fabrication Technology for Organic
Semiconductors
Jae Young ChoiNov. 13, 2007
![Page 2: Roll-to-Roll Fabrication Technology for Organic Semiconductors Jae Young Choi Nov. 13, 2007.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfc21a28abf838ca4e2d/html5/thumbnails/2.jpg)
Cost Saving, Simple Fabrication ProcessProducesFlexible Semiconductor Devices !
Roll-to-Roll Process
Motivation
- Low-temperature deposition- Mechanically Flexible- Light weight and shock proof- Chemical Sensitivity- Solution Processing
Organic Semiconductors
Non-Flexible DeviceExpensive Manufacturing Process
Complex Fabrication Process
Silicon Based Semiconductors
Why?
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BackgroundOTFT (Organic TFT)
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OverviewRoll-to-Roll Processing
Example:e-paper
manufacturing
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Technology ISubstrate Materials
GlassPlastic (PEN,
PI)Stainless Steel
• Optical Properties (Transparency)• Surface Smoothness• Thermal Expansion (Maximum Process Temperature)• Stiffness ( Durability, Flexibility, Young’s Modulus)
Properties to be Considered
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Technology IINovel Patterning Techniques (1)
Soft Lithography
- Mask and substrate contact may result in defects- Mask damage & stamping material life time
Issues
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Technology II
Embosser Mold & Embossed Microcups
Novel Patterning Techniques (2)
E-paper by SiPix
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Technology IINovel Patterning Techniques (3)
Laser Ablation
Recent Technology- Resolution: 120 pt/in- Droplet size: 10-80 picoliters- Speed: 200 mm/sec
Suffer form Drop Displacement Accuracy
-Faster than RIE -Produces Cleaner lines than Thermal and Mechanical Drilling
Inkjet Printing
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Technology IIIPackaging:Barrier Layer
Low work function metals oxide very easily Moisture & Oxygen Free Environment Needed
Requirement Water transmission rate = less than 10-6 g m‐2/day
Oxygen transmission rates = less than 10‐5 mL m‐2/day
Barix Coating TechniqueUsing continuous, roll-to-roll
vacuum processing
Directly Coating on the Top Eliminating the glued-on
metal can or the extra sheet of glass
Much thinner, lighter, more reliable display with low cost
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Conclusion: Now & Future
Organic LED (OLED)
Organic Solar Cell
Organic TFT
Organic Sensors
APPLICATIONS
$5M $339M
83.5 %Per year
Flexible Display Market Growth
2006 2013
1. Cost Saving2. Simple Fabrication Process3. Flexible Semiconductor Devices
Roll-to-Roll Process
Not so much cost saving yet“Killer Application” is Needed
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Reference
1. Evan Schwartz, “Roll to Roll Processing for Flexible Electronics,” 2. Jain, K. Klosner, M. Zemel, M. Raghunandan, S., “Flexible electronics and
displays: high-resolution, roll-to-roll, projection lithography and photoablation processing technologies for high-throughput production,”
3. Chin, Spencer. “Report: Flex display market to grow 83.5% a year.” EETimes Online. March 23, 2006.
4. Jain, K. “Flexible Electronics and Displays: High‐Resolution, Roll‐to‐Roll, Projection Lithography and Photoablation Processing Technologies for High‐ Throughput Production.” Proc. IEEE, 93, 1500‐1510, (2005).
5. Tan et. al. “Roller Nanoimprint Lithography.” J. Vac. Sci. Technol. B 16, 3926 (1998).
6. Vitex Systems, Inc. “The Guardian Tool.” Available online: http://www.vitexsys.com/guardian.html.
7. SiPix Imaging, Inc. “roll-to-roll© Manufacturing Process. Flexible Displays & Electronics”, 2004.