Abstract
The metastable behaviour induced by light soaking and reverse bias treatment in Cu(In, Ga)Se <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> (CIGS) based solar cells with vapour deposited indium sulphide buffer layer is compared to the baseline CdS-buffered devices. The dark and light current-voltage characteristics, capacitance-voltage doping profiles and admittance spectra have been measured and the influence of light soaking and reverse bias treatment on these characteristics were investigated. While the changes induced by both treatments on charge distribution in the absorber in both types of cells were similar, only a minor impact on the photovoltaic parameters of In <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> -buffered cells was observed. Thus we conclude that In <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> buffer is a good alternative to CdS in terms of ensuring a stable cell performance.
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