期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 27, 页码 10659-10665出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta04232e
关键词
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资金
- National Natural Science Foundation of China [21474088, 51561145001]
- Zhejiang Province Natural Science Foundation [LR13E030001]
- Joint NSFC-ISF Research Program
- Israel Science Foundation [51561145001]
- U.S. Office of Naval Research [N00014-15-1-2244]
- DOE, Office of Science, and Office of Basic Energy Sciences
Perylene diimide (PDI), which features intense absorption, a low-lying energy level, and high electron mobility, is a promising building block for electron acceptors in organic solar cells (OSCs). However, this planar molecule has a strong tendency to form large aggregates during film formation which strongly limits its OSC performance. Herein, we report a new and simple PDI derivative, B(PDI)(3), in which a central benzene unit is employed to connect three PDI arms. This compact arrangement of sterically bulky PDI moieties leads to a twisted molecular geometry of the resultant structure. This suppresses the strong crystallization tendency of PDI chromophores, owing to the broken molecular coplanarity and symmetry. Therefore, B(PDI) 3 is applied as a non-fullerene acceptor in OSCs, providing a good power conversion efficiency of 5.65% when blended with the PTB7-Th donor.
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