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Novel Copolymers Based Tetrafluorobenzene and Difluorobenzothiadiazole for Organic Solar Cells with Prominent Open Circuit Voltage and Stability
Author(s) -
Liao Xunfan,
Wu Feiyan,
An Yongkang,
Xie Qian,
Chen Lie,
Chen Yiwang
Publication year - 2017
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201600556
Subject(s) - copolymer , materials science , open circuit voltage , organic solar cell , polymer solar cell , crystallinity , acceptor , polymer , electron mobility , phenylene , conjugated system , photovoltaic system , polymer chemistry , chemical engineering , optoelectronics , energy conversion efficiency , voltage , composite material , electrical engineering , physics , condensed matter physics , engineering
Two novel copolymers based on benzothiadiazole (BT) or difluorobenzothiadizole (ffBT) with 2,2′‐(perfluoro‐1,4‐phenylene)dithiophene (2TPF4), namely PBT‐2TPF4 and PffBT‐2TPF4, are synthesized for applications in polymer solar cells (PSCs). A noticeably high open‐circuit voltage ( V oc ) of 1.017 and 0.87 V are achieved for PffBT‐2TPF4 and PBT‐2TPF4‐based devices, respectively. Although only a moderate efficiency (5.7%) of PBT‐2TPF4‐based devices is obtained, it is first demonstrated that 2TPF4 is a promising acceptor block for construction of the donor copolymers which possess high V oc , prominent crystallinity, and long‐term stability, simultaneously. Besides, two thienyl flanking the tetrafluorophenylene can decrease torsion angle between conjugated units, resulting in a high coplanar structure of copolymers to enhance their charge carrier mobility. The findings may open a promising and practical way to accelerate the commercialization of PSCs by developing a series of new donor copolymers for efficient and long‐term stable thickness bulk heterojunction PSCs.