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Enhanced hole mobility in ambipolar rubrene thin film transistors on polystyrene
6.J. H. Seo, D. S. Park, S. W. Cho, C. Y. Kim, W. C. Jang, C. N. Whang, K.-H. Yoo, G. S. Chang, T. Pedersen, A. Moewes, K. H. Chae, and S. J. Cho, Appl. Phys. Lett. 89, 163505 (2006).
11.S. Wu, Polymer Interface and Adhesion (Dekker, New York, 1982).
12.S. M. Sze, Physics of Semiconductor Devices (Wiley, New York, 1981).
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We report amorphous rubrene thin film transistors with a polystyrene intermediate layer on the gate dielectric that have hole mobilities up to . This improvement by two orders of magnitude over devices formed on alone occurs without the crystallization of rubrene. The enhanced charge transport is a result of the more planar growth and subsequent better geometrical connection of the first molecular layers of rubrene. Ambipolar conduction in the rubrene suggests that polystyrene minimizes the concentration of interfacial electron trap states.
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