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Patterning organic semiconductors using "dry" poly(dimethylsiloxane) elastomeric stamps for thin film transistors
Alejandro L Briseno1, Mark Roberts, Mang-Mang Ling
1Department of Chemistry and Biochemistry, University of California--Los Angeles, Los Angeles, California, USA.
Journal of the American Chemical Society
|March 23, 2006
Summary
This study presents a novel method for patterning organic semiconductors using selective wetting on polydimethylsiloxane (PDMS) stamps. This technique enables the fabrication of high-performance, flexible electronic devices with precise features.
Area of Science:
- Materials Science
- Organic Electronics
- Surface Chemistry
Background:
- Polydimethylsiloxane (PDMS) stamps are widely used in microfabrication.
- Patterning organic semiconductors often requires complex or multi-step processes.
Purpose of the Study:
- To develop a simple, fast, and reproducible method for patterning organic semiconductors and conducting polymers.
- To utilize unreacted low molecular weight (LMW) siloxane oligomers from PDMS stamps for selective wetting and patterning.
- To fabricate functional electronic devices, including flexible transistors.
Main Methods:
- Transferring LMW siloxane oligomers from dry PDMS stamps to surfaces via selective wetting.
- Patterning organic semiconductors and conducting polymers using dip-coating on modified surfaces.
- Fabricating functional transistor arrays and flexible transistors with patterned PEDOT electrodes.
Main Results:
- Achieved well-resolved feature sizes as small as 1 mum for patterned semiconductors.
- Demonstrated functional transistor arrays with field-effect mobilities up to 0.07 cm2/Vs.
- Successfully fabricated flexible transistors with patterned PEDOT source-drain electrodes.
Conclusions:
- The selective wetting method offers a simplified approach to patterning organic electronics, eliminating the need for self-assembled monolayers (SAMs).
- This technique is highly reproducible and suitable for fabricating various functional devices, including flexible electronics.
- The method facilitates efficient solution-based patterning of organic semiconductors and conducting polymers.
