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Intermolecular Arrangement of Fullerene Acceptors Proximal to Semiconducting Polymers in Mixed Bulk Heterojunctions
Author(s) -
Wang Chao,
Nakano Kyohei,
Lee Hsiao Fang,
Chen Yujiao,
Hong YouLee,
Nishiyama Yusuke,
Tajima Keisuke
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201801173
Subject(s) - fullerene , intermolecular force , organic solar cell , materials science , acceptor , copolymer , polymer solar cell , heterojunction , molecule , polymer , alkyl , conjugated system , chemical physics , electron acceptor , electron donor , nanotechnology , chemistry , photochemistry , organic chemistry , optoelectronics , physics , catalysis , composite material , condensed matter physics
Precise control of the molecular arrangements at the interface between the electron donor and acceptor in mixed bulk heterojunctions (BHJs) remains challenging, despite the correlation between structural characteristics and efficiency in organic photovoltaics (OPVs). This study reveals that the substitution patterns of linear and branched alkyl side chains on electron‐donating/‐accepting alternating copolymers can control the positions of an acceptor molecule (C 60 ) around the π‐conjugated main chains in mixed BHJs. Two‐dimensional solid‐state NMR demonstrates a marked difference in the location of C 60 in the blend films. A copolymer with an electron‐accepting unit positioned in close proximity to C 60 demonstrated higher OPV performance in combination with various fullerene derivatives. This molecular design offers precise control over the interfacial molecular structure, thereby paving the way for overcoming the current limitations of OPVs comprising mixed BHJs.