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

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 cm2 · V−1 · s−1 and an on/off current ratio of 6...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2005-12, Vol.26 (23), p.1835-1840
Main Authors: Champion, Richard D., Cheng, Kai-Fang, Pai, Chia-Ling, Chen, Wen-Chang, Jenekhe, Samson A.
Format: Article
Language:English
Subjects:
Application fields
Applied sciences
computer modeling
conjugated polymers
density functional theory
donor-acceptor copolymers
Electronics
Exact sciences and technology
field-effect transistors
Polymer industry, paints, wood
polyquinoxaline
polythiophene
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Technology of polymers
Transistors
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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 cm2 · V−1 · s−1 and an on/off current ratio of 6 × 105 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.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200500616