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A Comparative Study on Hole Transfer Inversely Correlated with Driving Force in Two Non-Fullerene Organic Solar Cells
Beihang Univ, Peoples R China; Natl Ctr Nanosci and Technol, Peoples R China.
Nanjing Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Beihang Univ, Peoples R China.
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2019 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 10, no 14, p. 4110-4116Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 10, no 14, p. 4110-4116
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-159578DOI: 10.1021/acs.jpclett.9b01383ISI: 000476694300043PubMedID: 31259556OAI: oai:DiVA.org:liu-159578DiVA, id: diva2:1342413
Note

Funding Agencies|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]

Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-13

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