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Title:
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Increasing the open circuit voltage of bulk-heterojunction solar cells by raising the LUMO level of the acceptor
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Author(s):
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Kooistra, F.B.; Knol, J.; Kastenberg, F.; Popescu, L.M.; Verhees, W.J.H.; Kroon, J.M.; Hummelen, J.C.
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Published by:
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Publication date:
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ECN
Solar Energy
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8-3-2007
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ECN report number:
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Document type:
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ECN-W--06-014
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Article (scientific)
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Number of pages:
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4
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Published in: Organic Letters (American Chemical Society), , 2007, Vol.9, p.551-554.
Abstract:
We report the synthesis, characterization, and electrochemical properties of ten new fullerene derivatives for usage in organic solar cells. The
phenyl ring of PCBM was substituted with electron-donating and electron-withdrawing substituents to study their influence on the LUMO level
of the parent fullerene. We varied the LUMO level over a range of 86 mV and show a small but significant change of the open circuit voltage
upon application in MDMO-PPV:methanofullerene bulk-heterojunction photovoltaic cells.
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