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Alternative Thieno[3,2‐b][1]benzothiophene Isoindigo Polymers for Solar Cell Applications
Author(s) -
Neophytou Marios,
Bryant Daniel,
Lopatin Sergei,
Chen Hu,
Hallani Rawad K.,
Cater Lewis,
McCulloch Iain,
Yue Wan
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.201700820
Subject(s) - benzothiophene , polymer solar cell , materials science , polymer , conjugated system , band gap , side chain , electron acceptor , acceptor , photovoltaic system , polymer chemistry , organic solar cell , chemical engineering , photochemistry , organic chemistry , optoelectronics , chemistry , thiophene , composite material , ecology , physics , biology , engineering , condensed matter physics
This work reports the synthesis, characterization, photophysical, and photovoltaic properties of five new thieno[3,2‐ b ][1]benzothiophene isoindigo (TBTI)‐containing low bandgap donor–acceptor conjugated polymers with a series of comonomers and different side chains. When TBTI is combined with different electron‐rich moieties, even small structural variations can have significant impact on thin film morphology of the polymer:phenyl C70 butyric acid methyl ester (PCBM) blends. More importantly, high‐resolution electron energy loss spectroscopy is used to investigate the phase‐separated bulk heterojunction domains, which can be accurately and precisely resolved, enabling an enhanced correlation between polymer chemical structure, photovoltaic device performance, and morphology.