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Diketopyrrolopyrrole‐based Conjugated Polymers Bearing Branched Oligo(Ethylene Glycol) Side Chains for Photovoltaic Devices
Author(s) -
Chen Xingxing,
Zhang Zijian,
Ding Zicheng,
Liu Jun,
Wang Lixiang
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201602775
Subject(s) - side chain , conjugated system , polymer , ethylene glycol , materials science , polymer solar cell , alkyl , stacking , polymer chemistry , photovoltaic system , band gap , chemical engineering , chemistry , organic chemistry , optoelectronics , composite material , engineering , ecology , biology
Conjugated polymers are essential for solution‐processable organic opto‐electronic devices. In contrast to the great efforts on developing new conjugated polymer backbones, research on developing side chains is rare. Herein, we report branched oligo(ethylene glycol) (OEG) as side chains of conjugated polymers. Compared with typical alkyl side chains, branched OEG side chains endowed the resulting conjugated polymers with a smaller π‐π stacking distance, higher hole mobility, smaller optical band gap, higher dielectric constant, and larger surface energy. Moreover, the conjugated polymers with branched OEG side chains exhibited outstanding photovoltaic performance in polymer solar cells. A power conversion efficiency of 5.37 % with near‐infrared photoresponse was demonstrated and the device performance could be insensitive to the active layer thickness.