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Improving Photovoltaic Performance of a Fused‐Ring Azepinedione Copolymer via a D–A–A Design
Author(s) -
Zhang Honghong,
Li Ting,
Xiao Zuo,
Lei Zhongli,
Ding Liming
Publication year - 2018
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.201700882
Subject(s) - copolymer , polymer solar cell , materials science , open circuit voltage , acceptor , conjugated system , energy conversion efficiency , photovoltaic system , short circuit , band gap , homo/lumo , ring (chemistry) , solar cell , polymer chemistry , optoelectronics , chemistry , voltage , polymer , molecule , physics , electrical engineering , organic chemistry , engineering , quantum mechanics , composite material , condensed matter physics
Two conjugated copolymer donors, PTTABDT and PBTTABDT, based on a fused‐ring azepinedione acceptor unit, 5‐(2‐octyldodecyl)‐4H‐thieno[2′,3′:4,5]thieno[3,2‐c]thieno[2′,3′:4,5]thieno[2,3‐e]azepine‐4,6(5H)‐dione (TTA), are prepared. PTTABDT possesses a conventional donor–acceptor (D–A) structure with one TTA in the repeat unit, while PBTTABDT has a D–A–A structure with two TTAs in the repeat unit. Compared with PTTABDT, PBTTABDT shows a deeper highest occupied molecular orbital (HOMO) level, a narrower bandgap, and a higher hole mobility, and exhibits better performance in bulk heterojunction solar cells. Power conversion efficiencies of 6.18% and 7.81% are achieved from PTTABDT:PC 71 BM and PBTTABDT:PC 71 BM solar cells, respectively. The higher performance of PBTTABDT:PC 71 BM solar cells results from the enhanced open‐circuit voltage ( V oc ) and short‐circuit current density ( J sc ).
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