Journal
APPLIED PHYSICS LETTERS
Volume 86, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1894597
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The silane self-assembled monolayer (SAM) modification of a SiO2 gate dielectric surface improved the molecular ordering of organic channel semiconductor in organic thin-film transistors (OTFTs), leading to a significant improvement in transistor performance. Mobility of up to 0.18 cm(2)/V s (current on/off ratio of 10(7)) was obtained for OTFTs with a liquid-crystalline polythiophene semiconductor built on an octyltrichlorosilane-modified SiO2 gate dielectric layer, a 450 times improvement over those built on a nonmodified dielectric layer. The mobility enhancement was attributed to the edge-on orientation of the polythiophene molecules induced by the silane SAM layer as deduced from the crystal domain structures in the atomic force microscopic images. (C) 2005 American Institute of Physics.
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