Browsing by Author "Tsai, Yan-Chu"

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Controllable carrier density of pentacene field-effect transistors using polyacrylates as gate dielectrics
(2008-12-01)
Cheng, Jung-An
;
Chuang, Chiao-Shun
;
Chang, Ming-Nung
;
Tsai, Yan-Chu
;
Shieh, Han-Ping D.
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 thin-film transistors (OTFTs). In top-contact OTFTs, the polyacrylates had a significant effect on field-effect mobilities ranging 0.093 similar to 0.195 cm(2) V-1 s(-1). 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 -8.62 V and 3.5 V, respectively, in comparison with those of PMMA devices. (C) 2008 Elsevier B.V. All rights reserved.
Organic thin film transistors with novel solution-process polymeric gate insulators
(2007)
Tsai, Yan-Chu
;
Tsai, Shu-Ting
;
Chuang, Chiao-Shun
;
Cheng, Jung-An
;
Chen, Fang-Chung
Novel OTFTs polymeric gate dielectric insulators derived from PMMA and PVP, named PHE, POH and F3, were demonstrated. By using the novel insulators, those OTFTs showed acceptable electrical characteristics including higher on/off ratio of five order of magnitude, low subthreshold swing about 2 V/decade and mobility around 0.1 cm(2)/Vs. F3 based devices, especially have the most stable I-V and C-V characteristics to replace PVP.