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Quinoline‐Flanked Diketopyrrolopyrrole Copolymers Breaking through Electron Mobility over 6 cm2 V−1 s−1 in Flexible Thin Film Devices

Abstract

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 cm2 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 105 with suppressed hole transport is first realized in the ambipolar DPP‐based copolymers.

The design and synthesis of quinoline‐flanked DPP (QDPP) motifs and corresponding copolymers named PQDPP‐T and PQDPP‐2FT with µe up to 6.04 cm2 V−1 s−1, which is the highest mobility in organic field‐effect transistors (OFETs) fabricated on flexible substrates to date, are reported. PQDPPs present one of the few promising candidates for n‐type dominant DPP polymers for OFET utilization.

Authors:   Zhenjie Ni, Huanli Dong, Hanlin Wang, Shang Ding, Ye Zou, Qiang Zhao, Yonggang Zhen, Feng Liu, Lang Jiang, Wenping Hu
Journal:   Advanced Materials
Year:   2018
Pages:   n/a
DOI:   10.1002/adma.201704843
Publication date:   18-Jan-2018
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