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Issue 39, 2012
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Observation of ambipolar field-effect behavior in donor–acceptor conjugated copolymers

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Abstract

Although donor (D)–acceptor (A) conjugated copolymers possess an electron deficient unit, most D–A copolymers exhibit only hole transport properties (p-type). While there are some D–A copolymers that show ambipolarity, n-type behaviour is highly dependent on the type of acceptor used. In this work, ambipolar field-effect behaviour was derived from general D–A conjugated copolymers, believed to be a typical p-type material, by introducing a functional passivation layer between gate dielectric and active layers using polypropylene-co-1-butene (PPcB). The PPcB layer effectively covered the hydroxyl groups and induced a reduction in the energetic disorder at the semiconductor–insulator interface. As a result, the FET devices fabricated using D–A conjugated copolymers, such as PCDTBT, PTBT and Si-PCPDTBT, showed clear ambipolar properties.

Graphical abstract: Observation of ambipolar field-effect behavior in donor–acceptor conjugated copolymers

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Supplementary files

Article information


Submitted
24 Jul 2012
Accepted
23 Aug 2012
First published
24 Aug 2012

J. Mater. Chem., 2012,22, 21238-21241
Article type
Paper

Observation of ambipolar field-effect behavior in donor–acceptor conjugated copolymers

S. Cho, J. H. Seo, G. Kim, J. Y. Kim and H. Y. Woo, J. Mater. Chem., 2012, 22, 21238
DOI: 10.1039/C2JM34872A

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