Investigation of Dark Heat and Light Soaking Treatment on Cu(In,Ga)Se2 Solar Cells using Impedance Spectroscopy
- Resource Type
- Conference
- Authors
- Zapalac, Geordie; Farshchi, Rouin; Bailey, Jeff; Poplavskyy, Dmitry
- Source
- 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) Photovoltaic Energy Conversion (WCPEC), 2018 IEEE 7th World Conference on. :3319-3323 Jun, 2018
- Subject
- Aerospace
Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Photonics and Electrooptics
Power, Energy and Industry Applications
Impedance
Temperature measurement
Capacitance
Photovoltaic cells
Junctions
Semiconductor process modeling
DH-HEMTs
- Language
Cu (In,Ga)Se 2 solar cell material was measured by impedance spectroscopy before and after 1000 hours of 85 °C dark heat treatment to investigate the impact of reducing the back electrode pre-selenization. Each condition was measured before and after 16 hours of light soaking at 1 sun. The impedance spectra in forward bias typically show a primary arc interpreted as recombination in the junction and a smaller arc at high frequencies interpreted as thermionic emission across a barrier. Recombination in the junction decreases with damp heat treatment for reduced back contact pre-selenization, but increases after light soaking for all conditions. Activation energies for the back contact barrier range between 90 meV and 174 meV depending upon the stress and pre-selenization conditions.