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Quinoline‐Flanked Diketopyrrolopyrrole Copolymers Breaking through Electron Mobility over 6 cm 2 V −1 s −1 in Flexible Thin Film Devices
Author(s) -
Ni Zhenjie,
Dong Huanli,
Wang Hanlin,
Ding Shang,
Zou Ye,
Zhao Qiang,
Zhen Yonggang,
Liu Feng,
Jiang Lang,
Hu Wenping
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.201704843
Subject(s) - quinoline , ambipolar diffusion , materials science , copolymer , electron mobility , electron , pyridine , band gap , electron deficiency , electron acceptor , optoelectronics , polymer chemistry , crystallography , photochemistry , polymer , organic chemistry , chemistry , physics , quantum mechanics , composite material
Herein, the design and synthesis of novel π‐extended quinoline‐flanked diketopyrrolopyrrole (DPP) [abbreviated as QDPP] motifs and corresponding copolymers named PQDPP‐T and PQDPP‐2FT for high performing n‐type organic field‐effect transistors (OFETs) in flexible organic thin film devices are reported. Serving as DPP‐flankers in backbones, quinoline is found to effectively tune copolymer optoelectric properties. Compared with TDPP and pyridine‐flanked DPP (PyDPP) analogs, widened bandgaps and strengthened electron deficiency are achieved. Moreover, both hole and electron mobility are improved two orders of magnitude compared to those of PyDPP analogs ( PPyDPP‐T and PPyDPP‐2FT ). Notably, featuring an all‐acceptor‐incorporated backbone, PQDPP‐2FT exhibits electron mobility of 6.04 cm 2 V −1 s −1 , among the highest value in OFETs fabricated on flexible substrates to date. Moreover, due to the widened bandgap and strengthened electron deficiency of PQDPP, n‐channel on/off ratio over 10 5 with suppressed hole transport is first realized in the ambipolar DPP‐based copolymers.