Performance Enhancement of Top-Contact Pentacene-Based Organic Thin-Film Transistors with Bilayer WO
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概要
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We fabricated top-contact pentacene-based organic thin-film transistors (OTFTs) with bilayer WO<inf>3</inf>/Au electrodes. Compared with those of a device without a WO<inf>3</inf>layer, the performance characteristics including field-effect mobility, threshold voltage, and On/Off ratio were highly improved in a device with a 5 nm WO<inf>3</inf>hole injection layer inserted. The field-effect mobility was increased from 0.47 to 0.69 cm<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup>and the On/Off ratio was also increased from 1.8\times 10^{4} to 4.1\times 10^{4}. From the results of evaluating the temperature dependence of I_{\text{D}}--V_{\text{D}} characteristics and the surface morphology of pentacene, the improved device performance was attributed to reductions in barrier height and surface roughness after inserting a suitable WO<inf>3</inf>layer between the pentacene and gold electrodes.
- 2013-03-25
著者
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Naka Shigeki
Graduate Scholl of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
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Okada Hiroyuki
Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
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Okada Hiroyuki
Graduate Scholl of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
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Wang Zhaokui
Graduate School of Science and Technology, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
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Alam Mir
Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
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