期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 5, 页码 3918-3926出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00611
关键词
alkynyl-function; pyrene; perylene diimide; nonfullerene acceptor; organic solar cells
资金
- National Natural Science Foundation of China [21875204, 51573153]
Integrating two or more perylene diimide (PDI) monomers through the single bond or ring fusion forming a star-shaped structure is a useful strategy for designing high-efficiency electron acceptors. Herein, we implemented an effectual acetylene-linked method of constructing star-shaped PDI-derivative-based high-efficiency nonfullerene organic solar cells (OSCs). A rigid and conjugated pyrene-cored PDI acceptor, B-4TPDI, has been designed and synthesized. The new acceptor manifests a favorable morphology, effective pi-electron delocalization, and complementary absorption when it is paired with the polymer donors PTB7-Th or PBDB-T. It is shown that OSCs based on the PTB7-Th:B-4TPDI blend film achieved a power conversion efficiency (PCE) of 7.71% and an outstanding J(sc) of 18.13 mA cm(-2). More importantly, after adding a small amount of B-4TPDI into the PTB7-Th:ITIC and PBDB-T:ITIC system, the formed ternary OSCs obtained an optimized PCE of 8.76% and 10.93%, respectively. Our work confirms that acetylene linkage would be a prospective pi-spacer for designing conjugated PDI-derivative-based new and excellent nonfullerene acceptors.
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