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Published on: December 5, 2015
Lamination method for the study of interfaces in polymeric thin film transistors
Michael L Chabinyc1, Alberto Salleo, Yiliang Wu
1Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, California 94304, USA. mchabinyc@parc.com
Journal of the American Chemical Society
|October 28, 2004
Summary
A novel lamination method enables fabrication of polymer thin-film transistors (TFTs). This technique enhances polymer semiconductor performance, suggesting molecular ordering, not interface electronics, dictates TFT mobility.
Area of Science:
- Materials Science
- Organic Electronics
- Nanotechnology
Background:
- Polymeric thin-film transistors (TFTs) are crucial for flexible electronics.
- Fabrication methods often limit device performance and scalability.
- Understanding factors influencing charge transport in polymer semiconductors is essential.
Purpose of the Study:
- To develop an efficient lamination-based fabrication method for polymer TFTs.
- To investigate the impact of surface treatments and molecular ordering on TFT performance.
- To compare the performance of lamination-fabricated TFTs with those made by conventional spin-coating.
Main Methods:
- Utilized poly(dimethylsiloxane) stamps for delaminating semiconducting polymer thin films from silicon wafers.
- Employed self-assembled monolayers (SAMs) of octyltrichlorosilane on silicon wafers and gate dielectrics.
- Fabricated coplanar TFTs using poly(3-hexylthiophene) (P3HT) and poly[5,5'-bis(3-dodecyl-2-thienyl)-2,2'-bithiophene] (PQT-12).
Main Results:
- Achieved effective field-effect mobilities of 0.03 cm²/(V s) for P3HT and 0.005 cm²/(V s) for PQT-12 on SAM-coated dielectrics.
- PQT-12 TFTs on non-SAM-coated dielectrics showed improved mobility of 0.03 cm²/(V s).
- Lamination-fabricated TFTs exhibited significantly higher mobilities compared to spin-coated counterparts (10⁻³–10⁻⁴ cm²/(V s)).
Conclusions:
- Lamination is a viable and effective method for fabricating high-performance polymer TFTs.
- Molecular ordering within the semiconducting polymer film significantly influences charge carrier mobility.
- The study challenges the notion that interface electronic effects are the primary cause of reduced mobility in polymer TFTs on hydrophilic dielectrics.
