Energy Level Alignment and Sub-Bandgap Charge Generation in Polymer:Fullerene Bulk Heterojunction Solar Cells

被引:39
作者
Tsang, Sai-Wing [1 ]
Chen, Song [1 ]
So, Franky [1 ]
机构
[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA
关键词
polymer solar cells; bulk heterojunction; electroabsorption; effective bandgap; energy level alignment; OPEN-CIRCUIT VOLTAGE; PHOTOVOLTAIC BLENDS; ELECTRON-TRANSFER; DIPOLE-MOMENT; POLYMER; ELECTROABSORPTION; DYNAMICS; EXCITONS; DISSOCIATION; SEPARATION;
D O I
10.1002/adma.201204495
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:2434 / 2439
页数:6
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