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Critical Role of Molecular Electrostatic Potential on Charge Generation in Organic Solar Cells
Chinese Acad Sci, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Chinese Acad Sci, Peoples R China; Univ Chinese Acad Sci, Peoples R China.
Chinese Acad Sci, Peoples R China; Univ Chinese Acad Sci, Peoples R China.
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2018 (English)In: Chinese journal of chemistry, ISSN 1001-604X, E-ISSN 1614-7065, Vol. 36, no 6, p. 491-494Article in journal (Refereed) Published
Abstract [en]

Revealing the charge generation is a crucial step to understand the organic photovoltaics. Recent development in non-fullerene organic solar cells (OSCs) indicates efficient charge separation even with negligible energetic offset between the donor and acceptor materials. These new findings trigger a critical question concerning the charge separation mechanism in OSCs, traditionally believed to result from sufficient energetic offset between the polymer donor and fullerene acceptor. We propose a new mechanism, which involves the molecular electrostatic potential, to explain efficient charge separation in non-fullerene OSCs. Together with the new mechanism, we demonstrate a record efficiency of similar to 12% for systems with negligible energetic offset between donor and acceptor materials. Our analysis also rationalizes different requirement of the energetic offset between fullerene-based and non-fullerene OSCs, and paves the way for further design of OSC materials with both high photocurrent and high photovoltage at the same time.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 36, no 6, p. 491-494
Keywords [en]
organic solar cells; non-fullerene acceptor; molecular electrostatic potential; exciton dissociation
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Identifiers
URN: urn:nbn:se:liu:diva-148081DOI: 10.1002/cjoc.201800015ISI: 000431977300003OAI: oai:DiVA.org:liu-148081DiVA, id: diva2:1211369
Note

Funding Agencies|National Natural Science Foundation of China [91633301, 51673201, 91333204]; Ministry of Science and Technology of China [2014CB643501]; Chinese Academy of Sciences [XDB12030200]; Swedish Research Council VR [2017-00744]; Swedish Energy Agency Energimyndigheten [2016-010174]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-05-30

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