Journal
APPLIED PHYSICS LETTERS
Volume 85, Issue 20, Pages 4663-4665Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1814443
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We found an abrupt reduction of contact resistance, R-c, in pentacene bottom-contact thin-film transistors (TFTs) with Au/Ti source/drain (S/D) electrodes when Ti thickness is below similar to3 nm. Our results suggest that the direct ohmic contact with a few molecular layer channel is a key to reduce the R-c of the S/D electrodes. We propose a Au/self-assembled monolayer electrode structure enabling direct ohmic contact with these few molecular layer channels, and achieved high-performance bottom-contact TFTs with an extrinsic mobility of 1.1 cm(2)/V s, an on/off ratio of 10(6), and a subthreshold swing of 0.3 V/decade. (C) 2004 American Institute of Physics.
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