TITLE

Controlled orientation of liquid-crystalline polythiophene semiconductors for high-performance organic thin-film transistors

AUTHOR(S)
Wu, Yiliang; Liu, Ping; Ong, Beng S.; Srikumar, Tharan; Zhao, Ni; Botton, Gianluigi; Zhu, Shiping
PUB. DATE
April 2005
SOURCE
Applied Physics Letters;4/4/2005, Vol. 86 Issue 14, p142102
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 cm2/V s (current on/off ratio of 107) 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.
ACCESSION #
16669635

 

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