期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 7, 页码 7208-7215出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20884
关键词
ternary polymer solar cell; hole transfer; morphology; non-fullerene acceptor; organic solar cell; energy loss; conjugated polymer
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Knowledge Economy [20123010010140, 20173010012960]
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT & Future Planning [NRF-2016M1A2A2940914]
- LG Chem Research Fund
In the field of organic solar cells, it has been generally accepted until recently that a difference in band energies of at least 0.3 eV between the highest occupied molecular orbital (HOMO) level of the donor and the HOMO of the acceptor is required to provide adequate driving force for efficient photoinduced hole transfer due to the large binding energy of excitons in organic materials. In this work, we investigate polymeric donor:non-fullerene acceptor junctions in binary and ternary blend polymer solar cells, which exhibit efficient photoinduced hole transfer despite negligible HOMO offset and demonstrate that hole transfer in this system is dependent on morphology. The morphology of the organic blend was gradually tuned by controlling the amount of ITIC and PC70BM. High external quantum efficiency was achieved at long wavelengths, despite ITIC-to-PC70BM ratio of 1:9, which indicates efficient photoinduced hole transfer from ITIC to the donor despite an undesirable HOMO energy offset. Transient absorption spectra further confirm that hole transfer from ITIC to the donor becomes more efficient upon optimizing the morphology of the ternary blend compared to that of donor:ITIC binary blend.
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