Increasing the open circuit voltage of bulk-heterojunction solar cells by raising the LUMO level of the acceptor.
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. [structure: see text].
Kooistra
Floris B
FB
Molecular Electronics, Materials Science CentrePlus, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Knol
Joop
J
Kastenberg
Fredrik
F
Popescu
Lacramioara M
LM
Verhees
Wiljan J H
WJ
Kroon
Jan M
JM
Hummelen
Jan C
JC