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A Conjugated Random Copolymer of Benzodithiophene‐Difluorobenzene‐Diketopyrrolopyrrole with Full Visible‐Light Absorption for Bulk‐Heterojunction Solar Cells
Author(s) -
Wang Zhihui,
Li Zhanfeng,
Zhang Haiqing,
Liu Weipeng,
Xu Xiaoxiang,
Si Changfeng,
Cui Yanxia,
Sun Qinjun,
Wang Hua,
Shi Fang,
Hao Yuying
Publication year - 2014
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201400334
Subject(s) - materials science , polymer solar cell , conjugated system , copolymer , thermogravimetric analysis , photochemistry , polymerization , open circuit voltage , polymer , absorption spectroscopy , polymer chemistry , absorption (acoustics) , homo/lumo , solar cell , chemistry , optoelectronics , organic chemistry , optics , physics , molecule , composite material , voltage , quantum mechanics
Stille coupling polymerization is used to synthesize a new donor–acceptor (D–A) conjugated random copolymer (PBDT‐DFB‐DPP) that comprises an electron‐rich benzodithiophene (BDT) unit in conjugation with electron‐deficient 2,5‐difluorobenzene (DFB) and diketopyrrolopyrrole (DPP) moieties, which have complementary light‐absorption behavior. The thermal, photophysical, and electrochemical properties of the polymer are investigated using thermogravimetric analysis, UV–vis absorption spectroscopy, and cyclic voltammetry. The random copolymer exhibits both broad light absorption and a low‐lying highest occupied molecular orbital (HOMO) level, which contribute to enhancement of the short‐circuit current density ( J sc ) and open‐circuit voltage ( V oc ). A bulk‐heterojunction polymer solar cell fabricated from PBDT‐DFB‐DPP and PC 60 BM exhibits a promising power conversion efficiency (PCE) of 2.50%.