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High‐Performance Ladder‐Type Heteroheptacene‐Based Nonfullerene Acceptors Enabled by Asymmetric Cores with Enhanced Noncovalent Intramolecular Interactions
Author(s) -
Tang Changquan,
Ma Xiaoling,
Wang JinYun,
Zhang Xue,
Liao Ruochuan,
Ma Yunlong,
Wang Peng,
Wang Pengsong,
Wang Tao,
Zhang Fujun,
Zheng Qingdong
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202105861
Subject(s) - stacking , intramolecular force , thiophene , chemistry , non covalent interactions , acceptor , stereochemistry , molecule , hydrogen bond , physics , organic chemistry , condensed matter physics
Nonfullerene acceptors (MQ3, MQ5, MQ6) are synthesized using asymmetric and symmetric ladder‐type heteroheptacene cores with selenophene heterocycles. Although MQ3 and MQ5 are constructed with the same number of selenophene heterocycles, the heteroheptacene core of MQ5 is end‐capped with selenophene rings while that of MQ3 is flanked with thiophene rings. With the enhanced noncovalent interaction of O⋅⋅⋅Se compared to that of O⋅⋅⋅S, MQ5 shows a bathochromically shifted absorption band and greatly improved carrier transport, leading to a higher power conversion efficiency (PCE) of 15.64 % compared to MQ3, which shows a PCE of 13.51 %. Based on the asymmetric heteroheptacene core, MQ6 shows an improved carrier transport induced by the reduced π–π stacking distance, related with the increased dipole moment in comparison with the nonfullerene acceptors based on symmetric cores. MQ6 exhibits a PCE of 16.39 % with a V OC of 0.88 V, a FF of 75.66 %, and a J SC of 24.62 mA cm −2 .