Defect related negative temperature coefficiency of short circuit current of Cu(In, Ga)Se 2 solar cells
Journal
Conference Record of the IEEE Photovoltaic Specialists Conference
Pages
001252-001254
Date Issued
2011
Author(s)
Abstract
The negative temperature coefficient of the short circuit current of Cu(In, Ga)Se 2 solar cells, contrary to the positive one of Si cells, may cause more degradation of power conversion efficiency at high temperature than Si solar cells due to defects. Photoluminescence spectra show both donor-acceptor transition and band-impurity transition. At higher temperature, more unoccupied states of donors and acceptors yield relatively low luminescence intensity from the donor-acceptor-pair transition, and become efficient traps to capture photo-generated carriers. This reflects that both the short circuit current and the external quantum efficiency degrade at high temperature due to the donor and acceptor states. © 2011 IEEE.
SDGs
Other Subjects
Cu(In , Ga)Se; Donor and acceptor; Donor-acceptors; External quantum efficiency; High temperature; Higher temperatures; Luminescence intensity; Negative temperatures; Photogenerated carriers; Photoluminescence spectrum; Power conversion efficiencies; Si solar cells; Unoccupied state; Conversion efficiency; Defects; Degradation; Lasers; Photoluminescence; Photovoltaic effects; Silicon; Gallium
Type
conference paper