Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 14, Pages 4110-4116Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b01383
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Funding
- National Natural Science Foundation of China [21875012, 21674006]
- National Natural Science Foundation of China (NSFC) [21773045]
- National Key Research and Development Program of China [2017YFA0206600]
- Chinese Academy of Science (100 Top Young Scientists Program)
- 111 Project
- Knut and Alice Wallenberg Foundation [2016.0059]
- Swedish Government Research Area in Materials Science on Functional Materials at Linkoping University [SFO-Mat-LiU 200900971]
- China Scholarship Council (CSC) [201708370115]
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We report a faster rate of hole transfer under a smaller AHomo in a comparative study of two group organic solar cells (OSCs) consisting of IT-4F as an acceptor and PBDBT and PBDBT-SF as donors. In the OSCs based on PBDBT. SF:IT-4F, a higher short-circuit current (J(SC)) was observed with a Delta(Homo) of 0.31 eV compared to a lower Jsc in PBDBT:IT-4F OSCs with a larger Delta(Homo) (0.45 eV). Intensive investigation indicates that the rate of transfer of a hole from IT-4F to PBDBT-SF or PBDBT is inversely proportional to the Delta(Homo) between IT-4F and donors. The larger Jsc in the PBDBT-SF:IT-4F device is attributed to a synergy of faster hole transfer, slower recombination, and rapid charge extraction enabled by desired morphology and balanced charge carrier mobilities with PBDBT-SF, suggesting that under a sufficiently high Delta(Homo), comprehensive considerations of the transport, film morphology, and energy levels are needed when designing new materials for high-performance OSCs.
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