Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 35, Pages 19314-19323Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202105861
Keywords
asymmetric cores; ladder-type heteroheptacene; noncovalent intramolecular interactions; nonfullerene acceptor; photovoltaics
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Funding
- National Natural Science Foundation of China [22075287, U1605241, 21774097, 52073221]
- Program of Youth Innovation Promotion Association CAS
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH032]
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By utilizing different arrangements of selenophene heterocycles, the photovoltaic performance of various nonfullerene acceptors can be improved, resulting in increased efficiency.
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 center dot center dot center dot Se compared to that of O center dot center dot center dot 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 pi-pi 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).
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