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Electronic Properties and Field-Effect Transistors of Thiophene-Based Donor–Acceptor Conjugated Copolymers

✍ Scribed by Richard D. Champion; Kai-Fang Cheng; Chia-Ling Pai; Wen-Chang Chen; Samson A. Jenekhe

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
205 KB
Volume
26
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: The thiophene‐quinoxaline donor–acceptor conjugated copolymer poly[(thiophene‐2,5‐diyl‐alt‐(2,3‐diheptylquinoxaline‐5,8‐diyl)] (PTHQx) was explored as a semiconductor in thin‐film organic field‐effect transistors (OFETs). A hole mobility of 3.6 × 10^−3^ cm^2^ · V^−1^ · s^−1^ and an on/off current ratio of 6 × 10^5^ were observed in p‐channel OFETs made from spin‐coated PTHQx thin films. The electronic structures of PTHQx and a related thiophene‐thienopyrazine donor–acceptor copolymer were calculated by density functional theory. Atomic force microscopy of PTHQx thin films showed a polycrystalline grain morphology that varied with the substrate.

Output (left) and transfer (right) characteristics of a PTHQx (structure shown) organic field‐effect transistor.

magnified imageOutput (left) and transfer (right) characteristics of a PTHQx (structure shown) organic field‐effect transistor.

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