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Diketopyrrolopyrrole tailoring charge transport characteristics of naphthalene diimide based polymers: From unipolar n ‐typed to ambipolar polymers
Author(s) -
Chen ZhiCai,
Fang RenRen,
Yu YuanYuan,
Gao JianHua,
Wan JunHua
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46926
Subject(s) - ambipolar diffusion , crystallinity , materials science , organic field effect transistor , polymer , copolymer , acceptor , polymer chemistry , electron mobility , band gap , transistor , chemical physics , field effect transistor , optoelectronics , chemistry , electron , physics , condensed matter physics , quantum mechanics , voltage , composite material
Random copolymerization approach is confirmed to be an effective way to tailor the electronic structure and crystallinity of donor–acceptor copolymers. Diketopyrrolopyrroles (DPPs) as the second acceptor units with variable ratios were incorporated into naphthalene diimide (NDI)‐based polymers to obtained three low‐band‐gap random copolymers ( P1–3 ). The low incorporation (10 and 30%) of DPP units did not substantially raise HOMO levels; thus, both P1 and P2 still exhibited unipolar n ‐channel characteristics. When the incorporation of DPP increased to 50%, the major carries in organic field effect transistor (OFET) in P3 were switched from n ‐channel to balanced ambipolar without sacrificing the electron mobility. However, P4 , an alternating polymer of NDI and DPP with defined structure, exhibited unipolar n ‐type transport characteristics because of the suppressed HOMO level. Polymer crystallinity and general macromolecular order have been studied carefully and discussed as it pertains to OFET performance. The present work thus highlights the structure–property relationship and the electronic tunability required in NDI‐based polymers to produce ambipolar transistors. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46926.