Transistor Properties of Novel Organic Conducting Polymers Bearing Tetrathiafulvalene Units in the Backbone

The organic field-effect transistor (OFET) properties of conducting polymers bearing a tetrathiafulvalene (TTF) unit in the backbone whose termini are capped with functional groups were investigated. The OFET devices were fabricated by a solution process under various fabrication conditions. All the...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2010-01, Vol.49 (1), p.01AB08-01AB08-4
Main Authors: Kashimura, Yoshiaki, Goto, Touichiro, Nakashima, Hiroshi, Furukawa, Kazuaki, Wang, Erjing, Li, Hongxiang, Hu, Wenping, Torimitsu, Keiichi
Format: Article
Language:English
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Summary:The organic field-effect transistor (OFET) properties of conducting polymers bearing a tetrathiafulvalene (TTF) unit in the backbone whose termini are capped with functional groups were investigated. The OFET devices were fabricated by a solution process under various fabrication conditions. All the devices showed typical p-type semiconducting behavior as expected from the electron-donating properties of TTF derivatives. Cast films exhibited higher field-effect mobilities than spin-coated films. Surface treatment with organic silane molecules produced no noticeable effects. When using thioacetyl-capped polymer, treatment of the OFET device in an ammonia atmosphere resulted in a field-effect mobility one order of magnitude higher than that of the pristine film. By contrast, there was no such enhancement with ethyl acetate-capped polymer. Atomic force microscopy observations revealed that the ammonia treatment promoted the ordering of the polymer chain, which resulted in improved electronic conduction.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.49.01AB08