High photoresponsivity of pentacene-based organic thin-film transistors with UV-treated PMMA dielectrics

Hsiao-Wen Zan*, Kuo H. Yen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

A simple UV-treatment process for poly(methyl methacrylate) (PMMA) dielectric is proposed to enhance photoresponsivity of pentacene-based organic thin-film transistors. The UV treatment creates excess negatively charged sites on the PMMA dielectric, which makes the device exhibit a large photoinduced current and prolongs persistent conductance recovery. In order to describe time-dependent photoinduced current, double-time constant equations are proposed. Based on time-constant fittings, slow-varied responses are found to be influenced by the UV treatment. The rapid-varied response is independent of gate bias and UV treatment. A plausible model for spatial carrier distribution is discussed and proposed to describe this observed phenomenon.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Volume11
Issue number8
DOIs
StatePublished - 23 Jun 2008

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