Performance degradation of CIGS photovoltaic modules by light soaking and reverse bias

Copper indium gallium selenide (CIGS) solar cells are one of the most compromising candidates for high efficiency thin-film solar cells. It was observed to exhibit metastabilities and performance changes with light exposure. This work consists of a climate chamber, which allows the study of the effect of light exposure on device efficiency, under voltage biasing. Performance is characterized using current-voltage (I-V) curve of the modules during the test; the characteristic parameters like maximum power, open circuit voltage, short circuit current, and resistance can be extracted. The I-V measurements allowed us to determine the impact of light exposure on the performance of CIGS solar cells and observe the degradation behaviour.