Field Effect in CdSeTe/CdTe Solar Cells with Biased Spectroscopy
Pascal Jundt1, Darius Kuciauskas2, James Sites1
1Colorado State University, Fort Collins, CO, United States
/2National Renewable Energy Laboratory, Golden, CO, United States

Photoluminescence (PL) and time-resolved photoluminescence (TRPL) measurements were performed under external bias on thin CdSeTe/CdTe solar cells. The results indicate that internal field effects which go unnoticed during traditional, unbiased spectroscopy measurements may be more consequential than generally realized. We show that modulating the internal field strength can have a dramatic effect on PL intensity and TRPL lifetime, and that injection light itself can have significant effects on the field. In addition, probing the field behavior with bias can allow the determination of  transport characteristics, such as mobility.