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

来源：

ADVANCED MATERIALS | 2013年 / 25卷 / 17期

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

页码：2434 / 2439

页数：6

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