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Design rules for minimizing voltage losses in high-efficiency organic solar cells
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Georgia Inst Technol, GA 30332 USA; Georgia Inst Technol, GA 30332 USA.
Chinese Acad Sci, Peoples R China.
Ecole Polytech Fed Lausanne, Switzerland.
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2018 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660, Vol. 17, no 8, p. 703-+Article in journal (Refereed) Published
Abstract [en]

The open-circuit voltage of organic solar cells is usually lower than the values achieved in inorganic or perovskite photovoltaic devices with comparable bandgaps. Energy losses during charge separation at the donor-acceptor interface and non-radiative recombination are among the main causes of such voltage losses. Here we combine spectroscopic and quantum-chemistry approaches to identify key rules for minimizing voltage losses: (1) a low energy offset between donor and acceptor molecular states and (2) high photoluminescence yield of the low-gap material in the blend. Following these rules, we present a range of existing and new donor-acceptor systems that combine efficient photocurrent generation with electroluminescence yield up to 0.03%, leading to non-radiative voltage losses as small as 0.21 V. This study provides a rationale to explain and further improve the performance of recently demonstrated high-open-circuit-voltage organic solar cells.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 17, no 8, p. 703-+
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-150232DOI: 10.1038/s41563-018-0128-zISI: 000439573400015PubMedID: 30013057OAI: oai:DiVA.org:liu-150232DiVA, id: diva2:1240728
Note

Funding Agencies|Swedish Energy Agency Energimyndigheten [2016-010174]; Swedish Research Council VR [621-2013-5561, 2016-06146, 2017-00744]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]; National Natural Science Foundation of China [91633301, 51673201, 21325419]; Chinese Academy of Sciences [XDB12030200]; China Scholarship Council (CSC) [201306730002]; Department of the Navy, Office of Naval Research, under the MURI Center for Advanced Organic Photovoltaics [N00014-14-1-0580, N00014-16-1-2520]; European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme [639750, 717026]; Swiss National Science Foundation

Available from: 2018-08-22 Created: 2018-08-22 Last updated: 2019-06-28

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