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Thiazole Imide‐Based All‐Acceptor Homopolymer: Achieving High‐Performance Unipolar Electron Transport in Organic Thin‐Film Transistors
Author(s) -
Shi Yongqiang,
Guo Han,
Qin Minchao,
Zhao Jiuyang,
Wang Yuxi,
Wang Hang,
Wang Yulun,
Facchetti Antonio,
Lu Xinhui,
Guo Xugang
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201705745
Subject(s) - materials science , ambipolar diffusion , acceptor , electron mobility , transistor , organic electronics , organic semiconductor , electron acceptor , optoelectronics , thiazole , copolymer , organic field effect transistor , polymer , thin film transistor , nanotechnology , electron , field effect transistor , photochemistry , organic chemistry , condensed matter physics , composite material , electrical engineering , chemistry , physics , engineering , quantum mechanics , voltage , layer (electronics)
High‐performance unipolar n‐type polymer semiconductors are critical for advancing the field of organic electronics, which relies on the design and synthesis of new electron‐deficient building blocks with good solubilizing capability, favorable geometry, and optimized electrical properties. Herein, two novel imide‐functionalized thiazoles, 5,5′‐bithiazole‐4,4′‐dicarboxyimide (BTzI) and 2,2′‐bithiazolothienyl‐4,4′,10,10′‐tetracarboxydiimide (DTzTI), are successfully synthesized. Single crystal analysis and physicochemical study reveal that DTzTI is an excellent building block for constructing all‐acceptor homopolymers, and the resulting polymer poly(2,2′‐bithiazolothienyl‐4,4′,10,10′‐tetracarboxydiimide) (PDTzTI) exhibits unipolar n‐type transport with a remarkable electron mobility (μ e ) of 1.61 cm 2 V −1 s −1 , low off‐currents ( I off ) of 10 −10 −10 −11 A, and substantial current on/off ratios ( I on / I off ) of 10 7 −10 8 in organic thin‐film transistors. The all‐acceptor homopolymer shows distinctive advantages over prevailing n‐type donor−acceptor copolymers, which suffer from ambipolar transport with high I off s > 10 −8 A and small I on / I off s < 10 5 . The results demonstrate that the all‐acceptor approach is superior to the donor−acceptor one, which results in unipolar electron transport with more ideal transistor performance characteristics.