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Controllable carrier density of pentacene field-effect transistors using polyacrylates as gate dielectrics

✍ Scribed by Jung-An Cheng; Chiao-Shun Chuang; Ming-Nung Chang; Yan-Chu Tsai; Han-Ping D. Shieh

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 486 KB
Volume: 9
Category: Article
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2008.08.004

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✦ Synopsis

We have studied the effect of the chemical structure of dielectrics by evaporating pentacene onto a series of polyacrylates: poly(methylmethacrylate), poly(4-methoxyphenylacrylate), poly(phenylacrylate), and poly(2,2,2-trifluoroethyl methacrylate) in organic thinfilm transistors (OTFTs). In top-contact OTFTs, the polyacrylates had a significant effect on field-effect mobilities ranging 0.093 $ 0.195 cm 2 V À1 s À1 . This variation neither correlated with the polymer surface morphology nor the observed pentacene crystallite size. This result implies that the PTFMA device generates the local electric field that accumulates holes and significantly shifts the threshold voltage and the turn-on voltage to À8.62 V and 3.5 V, respectively, in comparison with those of PMMA devices.

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