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Ladder‐Type Heteroheptacenes with Different Heterocycles for Nonfullerene Acceptors
Author(s) -
Ma Yunlong,
Cai Dongdong,
Wan Shuo,
Wang Pengsong,
Wang Jinyun,
Zheng Qingdong
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202007907
Subject(s) - stacking , acceptor , thiophene , band gap , polymer , energy conversion efficiency , chemistry , polymer solar cell , heterojunction , absorption (acoustics) , materials science , optoelectronics , organic chemistry , physics , composite material , condensed matter physics
The design, synthesis, and characterization of two novel nonfullerene acceptors (M8 and M34) based on ladder‐type heteroheptacenes with different heterocycles are reported. Replacing the furan heterocycles with the thiophene heterocycles in the heteroheptacene backbone leads to a hypsochromically shifted absorption band and greatly improved carrier transport for the resulting nonfullerene acceptor (M34) although the π–π‐stacking distances are barely affected. Bulk‐heterojunction polymer solar cells fabricated from M34 and a wide band gap polymer (PM6) as the donor showed a best power conversion efficiency (PCE) of 15.24 % with an open circuit voltage (V OC ) of 0.91 V, much higher than a PCE of 4.21 % and a V OC of 0.83 V for the counterparts based on M8:PM6. These results highlight the importance of key atoms in the construction of high‐performance nonfullerene acceptors.