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Ternary organic solar cells with enhanced open circuit voltage
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
Chalmers, Sweden.
Lund University, Sweden.
Aix Marseille University, France.
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2017 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 37, 24-31 p.Article in journal (Refereed) Published
Abstract [en]

By introducing a non-fullerene small molecule acceptor as a third component to typical polymer donor: fullerene acceptor binary solar cells, we demonstrate that the short circuit current density (J(sc)), open circuit voltage (V-oc), power conversion efficiency (PCE) and thermal stability can be enhanced simultaneously. The different surface energy of each component causes most of the non-fullerene acceptor molecules to self-organize at the polymer/fullerene interface, while the appropriately selected oxidation/reduction potential of the non-fullerene acceptor enables the resulting ternary junction to work through a cascade mechanism. The cascade ternary junction enhances charge generation through complementary absorption between the non-fullerene and fullerene acceptors and aids the efficient charge extraction from fullerene domains. The bimolecular recombination in the ternary blend layer is reduced as the ternary cascade junction increases the separation of holes and electrons during charge transportation and the trap assistant recombination induced by integer charge transfer (ICT) state potentially reduced due to the smaller pinning energy of inserted non-fullerene acceptor, leading to an unprecedented increase in the open circuit voltage beyond the binary reference values.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 37, 24-31 p.
Keyword [en]
Ternary organic solar cell; Self-organization; Higher open circuit voltage; Generality; More thermal stable
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-138887DOI: 10.1016/j.nanoen.2017.04.060ISI: 000402704500004OAI: oai:DiVA.org:liu-138887DiVA: diva2:1115950
Note

Funding Agencies|Knut and Alice Wallenberg Foundation; Swedish Research Council [2013-4022]; Ministry of Science and Technology [2016YFA0200700]; NSFC [21504066, 21534003]; Goran Gustafsson Foundation for Research in Natural Sciences and Medicine; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkping University [2009 00971]; China Scholarship Council; Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]

Available from: 2017-06-27 Created: 2017-06-27 Last updated: 2017-06-27

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