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Synergistic Effects of Selenophene and Extended Ladder‐Type Donor Units for Efficient Polymer Solar Cells
Author(s) -
Wang HuaChun,
Li QingYa,
Yin HongBo,
Ren Xiancheng,
Yao Kai,
Zheng Yonghao,
Xu YunXiang
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.201700483
Subject(s) - thiophene , quinoxaline , materials science , acceptor , electron donor , polymer , energy conversion efficiency , absorption (acoustics) , polymer chemistry , chemistry , organic chemistry , optoelectronics , physics , composite material , condensed matter physics , catalysis
Two pairs of polymer donor materials based on indacenodithiophene (IDT) and indacenodithieno[3,2‐ b ]thiophene (IDTT) as the donor units are synthesized. Thiophene or selenophene is introduced as the π‐bridge units and electron‐deficient fluorine‐substituted quinoxaline is used as acceptor unit. Selenophene‐containing polymers PIDT‐DFQ‐Se and PIDTT‐DFQ‐Se show redshifted absorption and narrower bandgaps. Combined with IDTT donor unit, PIDTT‐DFQ‐Se shows the highest absorption coefficient. Both the IDTT unit and selenophene unit have positive effects on the hole mobilities, making PIDTT‐DFQ‐Se the highest one. The best power conversion efficiency of 7.4% is obtained from devices based on PIDTT‐DFQ‐Se:[6,6]‐phenyl C 71 butyric acid methyl ester (PC 71 BM) with a J sc of 12.6 mA cm −2 , a V oc of 0.89 V, and a fill factor (FF) of 0.66.