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Open circuit voltage and efficiency in ternary organic photovoltaic blends
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.
Chalmers University of Technology, Göteborg, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering. Eindhoven University of Technology, Netherlands.ORCID iD: 0000-0002-7104-7127
2016 (English)In: Energy & Environmental Science, ISSN 1754-5692, E-ISSN 1754-5706, Vol. 9, no 1, 257-266 p.Article in journal (Refereed) PublishedText
Abstract [en]

Organic bulk heterojunction solar cells based on ternary blends of two donor absorbers and one acceptor are investigated by experiments and modeling. The commonly observed continuous tunability of the open circuit voltage V-OC with the donor1 : donor2 ratio can quantitatively be explained as quasi-Fermi level splitting due to photocreated charges filling a joint density of states that is broadened by Gaussian disorder. On this basis, a predictive model for the power conversion efficiency that accounts for the composition-dependent absorption and the shape of the current-voltage characteristic curve is developed. When all other parameters, most notably the fill factor, are constant, we find that for state-of-the-art absorbers, having a broad and strong absorption spectrum, ternary blends offer no advantage over binary ones. For absorbers with a more narrow absorption spectrum ternary blends of donors with complementary absorption spectra, offer modest improvements over binary ones. In contrast, when, upon blending, transport and/or recombination kinetics are improved, leading to an increased fill factor, ternaries may offer significant advantages over binaries.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 9, no 1, 257-266 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-124474DOI: 10.1039/c5ee03095aISI: 000367622700030OAI: oai:DiVA.org:liu-124474DiVA: diva2:899753
Note

Funding Agencies|Swedish Research Council

Available from: 2016-02-02 Created: 2016-02-01 Last updated: 2016-05-27

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The full text will be freely available from 2016-11-19 00:00
Available from 2016-11-19 00:00

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Felekidis, NikolaosKemerink, Martijn
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