Increasing the Open Circuit Voltage of Bulk-Heterojunction Solar Cells by Raising the LUMO Level of the Acceptor
作者:Floris B. Kooistra、Joop Knol、Fredrik Kastenberg、Lacramioara M. Popescu、Wiljan J. H. Verhees、Jan M. Kroon、Jan C. Hummelen
DOI:10.1021/ol062666p
日期:2007.2.1
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 parentfullerene. We varied the LUMO level over a range of 86 mV and show a small but significant change of the