Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 36, Issue 6, Pages 491-494Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.201800015
Keywords
organic solar cells; non-fullerene acceptor; molecular electrostatic potential; exciton dissociation
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Funding
- 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]
- Swedish Research Council [2017-00744] Funding Source: Swedish Research Council
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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.
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