Browsing by Author "Wang, Kai-Ruei"

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Achieving saturation in vertical organic transistors for organic light-emitting diode driving by nanorod channel geometric control
(2013-04-22)
Li, Chang-Hung
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Stehlin, Fabrice
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Wang, Kai-Ruei
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Lin, Yu-Hsin
;
Wieder, Fernand
When conventional field-effect transistors with short channel length suffer from non-saturated output characteristics, this work proposed a vertical channel transistor to operate like a solid-state vacuum tube and exhibit good saturated curves. We utilized deep ultra-violet interference lithography to produce ordered grid-like metal to control the potential profile in vertical channel. We compared experimental and simulated characteristics to investigate the keys to achieve saturation. Finally, with an optimized design, a vertical organic transistor is used to drive a solution-processed white-light organic light-emitting diode to perform a luminescence control (0-260 cd/m(2)) with a 3.3-V base potential swing. (C) 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4802999]
Large-area non-close-packed nanosphere deposition by blade coating for vertical space-charge-limited transistor
(2012-12-01)
Chao, Yen-Chu
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Wang, Kai-Ruei
;
Meng, Hsin-Fei
;
Zan, Hsiao-Wen
;
Hsu, Yung-Hsuan
In this work, we proposed a fast and controllable blade coating process to form non-close-packed nanosphere structures. We investigated the key to obtain well-distributed non-close-packed PS spheres with blade coating. We utilized the blade-coated nanosphere structure to realize colloidal lithography and fabricate a vertical channel polymer transistor, the space-charge-limited transistor (SCLT). We demonstrated that SCLT utilizing blade-coated nanospheres delivered 13.9 mA/cm(2) at 1.8 V with an on/off current ratio as 45,000. The process of blade-coating nanospheres may facilitate the commercialization of low-cost colloidal lithography. (C) 2012 Elsevier B.V. All rights reserved.