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Increased Open‐Circuit Voltage of Organic Solar Cells by Reduced Donor‐Acceptor Interface Area
Author(s) -
Vandewal Koen,
Widmer Johannes,
Heumueller Thomas,
Brabec Christoph J.,
McGehee Michael D.,
Leo Karl,
Riede Moritz,
Salleo Alberto
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201400114
Subject(s) - open circuit voltage , materials science , acceptor , photovoltaic system , organic solar cell , voltage , optoelectronics , charge (physics) , interface (matter) , charge carrier , recombination , electrical engineering , condensed matter physics , chemistry , physics , quantum mechanics , capillary number , composite material , capillary action , engineering , biochemistry , gene
The charge carrier lifetime in small molecule: C 60 photovoltaic devices is increased by reducing the physical interface area availabe for recombination. For donor contents below 10%, the gain in open‐circuit voltage ( V oc ) depends logarithmically on the interface area while the energy of the interfacial charge‐transfer state E CT remains invariant.
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