Journal
ORGANIC ELECTRONICS
Volume 11, Issue 2, Pages 351-355Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2009.10.019
Keywords
Organic field-effect transistors; Polythiophene; Polymethylmethacrylate; Air stability
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Organic field-effect transistors (OFETs) based on regioregular poly(3-hexyl-thiophene) (P3HT) have been demonstrated with improved ambient-air stability. Substrates of untreated SiO2, octadecyltrichlorosilane (OTS)-treated SiO2, and SiO2 coated with a thin layer of polymethylmethacrylate (PMMA) were compared in terms of OFET electric performance and air stability. We are able to show virtually no change in transistor on/off ratio over a 3-day period in ambient air in OFETs fabricated on SiO2-PMMA substrates. We also studied devices based on OTS-treated PMMA interface. By analyzing the surface morphology, possible mechanisms of the enhanced air stability are discussed. (C) 2009 Elsevier B.V. All rights reserved.
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