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Electronic Properties and Field‐Effect Transistors of Thiophene‐Based Donor–Acceptor Conjugated Copolymers
Author(s) -
Champion Richard D.,
Cheng KaiFang,
Pai ChiaLing,
Chen WenChang,
Jenekhe Samson A.
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200500616
Subject(s) - thiophene , materials science , acceptor , organic semiconductor , field effect transistor , conjugated system , thin film , copolymer , substrate (aquarium) , organic field effect transistor , transistor , optoelectronics , polymer chemistry , polymer , nanotechnology , organic chemistry , chemistry , condensed matter physics , electrical engineering , composite material , physics , oceanography , engineering , voltage , geology
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.