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ECN publication
Title:
Increasing the open circuit voltage of bulk-heterojunction solar cells by raising the LUMO level of the acceptor
 
Author(s):
Kooistra, F.B.; Knol, J.; Kastenberg, F.; Popescu, L.M.; Verhees, W.J.H.; Kroon, J.M.; Hummelen, J.C.
 
Published by: Publication date:
ECN Solar Energy 8-3-2007
 
ECN report number: Document type:
ECN-W--06-014 Article (scientific)
 
Number of pages:
4  

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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