期刊
ADVANCED MATERIALS
卷 25, 期 17, 页码 2434-2439出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201204495
关键词
polymer solar cells; bulk heterojunction; electroabsorption; effective bandgap; energy level alignment
类别
资金
- Department of Energy Basic Energy Sciences [DE-FG0207ER46464]
Using charge modulated electroabsorption spectroscopy (CMEAS), for the first time, the energy level alignment of a polymer: fullerene bulk heterojunction photovoltaic cell is directly measured. The charge-transfer excitons generated by the sub-bandgap optical pumping are coupled with the modulating electric field and introduce subtle changes in optical absorption in the sub-bandgap region. This minimum required energy for sub-bandgap charge genreation is defined as the effective bandgap.
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