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Published on: June 30, 2018
Roll-printed organic thin-film transistor using patterned poly(dimethylsiloxane) (PDMS) stamp.
Jeongdai Jo1, Jong-Su Yu, Taik-Min Lee
1Nano-Mechanical Systems Research Division, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Korea.
Journal of Nanoscience and Nanotechnology
|April 3, 2010
Summary
Roll-printing enables fabrication of organic thin-film transistors (OTFTs) on plastic substrates with improved performance. This method significantly reduces fabrication steps compared to traditional techniques.
Area of Science:
- Materials Science
- Electronics Engineering
- Organic Electronics
Background:
- Organic thin-film transistors (OTFTs) are crucial for flexible electronics.
- Traditional fabrication methods for OTFTs are often complex and costly.
- Developing scalable and efficient fabrication techniques for OTFTs is essential.
Purpose of the Study:
- To investigate the feasibility of roll-printing for fabricating OTFTs on flexible plastic substrates.
- To evaluate the performance characteristics of roll-printed OTFTs.
- To demonstrate a simplified fabrication process for OTFTs.
Main Methods:
- Fabrication of gate, source, and drain electrodes using gravure or gravure-offset printing with patterned poly(dimethylsiloxane) (PDMS) stamps and silver (Ag) pastes.
- Utilizing polyvinylphenol (PVP) as a polymeric dielectric and bis(triisopropyl-silylethynyl) pentacene (TIPS-pentacene) as an organic semiconductor.
- Forming bottom-contact OTFTs through spin coating or ink-jetting on flexible plastic substrates.
Main Results:
- Achieved field-effect mobility between 0.08 and 0.1 cm²/Vs.
- Obtained on/off current ratios ranging from 10⁴ to 10⁵.
- Measured subthreshold slopes between 1.96 and 2.32 V/decade.
- Successfully fabricated OTFTs with channel lengths from 12 to 74 µm on plastic substrates.
- Reduced fabrication process by 20 steps compared to conventional methods.
Conclusions:
- Roll-printing with patterned PDMS stamps and soluble processes offers a viable method for producing high-performance OTFTs on flexible substrates.
- The developed technique enables precise control over channel length, overcoming limitations of traditional printing.
- This simplified fabrication process holds significant potential for large-scale, cost-effective manufacturing of printed electronics.
