Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 3, Pages 927-934Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b03502
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Funding
- National Key Research and Development Program of China [2017YFA0206600]
- Key Research Program of Frontier Science, Chinese Academy of Sciences [QYZDBSSW-SLH006]
- National Natural Science Foundation of China [61674141, 51972300, 21975245]
- Hundred Talents Program (Chinese Academy of Sciences)
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High power conversion efficiency can be realized by using a ternary bulk heterojunction with complementary absorption spectra in organic solar cells. However, as the development of nonfullerene acceptors with a broad absorption spectrum makes the absorption efficiency of the photovoltaic devices close to optimal, such a strategy needs modifying. In particular, charge transfer between the two acceptors is necessary to be considered. Herein, we purposely design a ternary system based on PTB7Th:CO(i)8DFIC:ITIC-4F. Though the presence of ITIC-4F in PTB7-Th:CO(i)8DFIC could not broaden the absorption spectrum obviously, the formed cascade-energy-level alignment is beneficial for promoting and balancing exciton separation and charge transport between the donor and two acceptors and even between the acceptors. Insights into the charge transport route in the completed system are provided via using the techniques including photoluminescence spectroscopy and pump-probe photoconductivity spectroscopy. This work provides a new idea for designing highly efficient ternary organic solar cells.
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