期刊
SOLAR RRL
卷 5, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100094
关键词
naphthalene cores; noncovalent conformational locks; organic solar cells; regioisomeric effects; unfused-ring electron acceptors
资金
- NSFC [21774130, 51925306]
- National Key R&D Program of China [2018FYA 0305800]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-JSC046]
- Key Research Program of the Chinese Academy of Sciences [XDPB08-2]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB28000000]
- China Postdoctoral Science Foundation [2020M670425]
Isomeric effects were systematically studied on unfused-ring electron acceptors, leading to the discovery of the PBDB-T:NOF-3 based device with higher power conversion efficiency and stable performance. These findings suggest that isomeric effects play a crucial role in designing high-performance UREAs.
Isomeric effects play a crucial role in regulating electronic properties, molecular packing, and device performance of organic semiconductors. Herein, a series of unfused-ring electron acceptor (UREA) regioisomers (NOF-1, NOF-2, and NOF-3), which are constructed using 2,6-alpha-, 1,5-beta-, and 3,7-beta-type naphthalene cores, are successfully synthesized and characterized. The regioisomeric effects on geometries, photophysics, electrical properties, molecular packing behaviors, charge transport properties, blend film morphologies, and photovoltaic performance are systematically studied. As a result, the PBDB-T:NOF-3-based device delivers a power conversion efficiency (PCE) of 11.58% due to its more balanced charge mobility, efficient exciton dissociation, less charge recombination, and favorable film morphology. These findings encourage further attention to the regioisomeric effects to design high-performance UREAs.
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