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Optical Gaps of Organic Solar Cells as a Reference for Comparing Voltage Losses
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Chinese Acad Sci, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2018 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 8, no 28, article id 1801352Article in journal (Refereed) Published
Abstract [en]

The voltage loss, determined by the difference between the optical gap (E-g) and the open-circuit voltage (V-OC), is one of the most important parameters determining the performance of organic solar cells (OSCs). However, the variety of different methods used to determine E-g makes it hard to fairly compare voltages losses among different material systems. In this paper, the authors discuss and compare various E-g determination methods and show how they affect the detailed calculation of voltage losses, as well as predictions of the maximum achievable power conversion efficiency. The aim of this paper is to make it possible for the OSC community to compare voltage losses in a consistent and reasonable way. It is found that the voltage losses for strongly absorbed photons in state-of-the-art OSCs are not much less than 0.6 V, which still must be decreased to further enhance efficiency.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 8, no 28, article id 1801352
Keywords [en]
optical gap; organic solar cells; Shockley-Queisser limit; voltage losses
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:liu:diva-152054DOI: 10.1002/aenm.201801352ISI: 000446421200012OAI: oai:DiVA.org:liu-152054DiVA, id: diva2:1259446
Note

Funding Agencies|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]; DFG [KI-1571/2-1]; China Scholarship Council

Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2019-01-14

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Wang, YumingQian, DepingZhang, HuotianGao, Feng
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