Abstract:
The copper indium gallium selenium (CIGS) thin film is widely acknowledged
as the most promising material for photovoltaic applications. Mainly due to
appealing chemical and physical structures properties, low fabrication cost,
high efficiency, and uncomplicated integration especially with the advance ment in the use of the flexible substrate. Promising results have been achieved
in CIGS-based solar cells in the last few years and these devices could be key
in unlocking the potential of green energy. Therefore, it is necessary to un derstand the parameters that are critical to improving the efficiency of these
devices. Parameters such as doping concentration, thickness, substrates, and
energy bandgap. In this review, we comprehensively report on these parame ters with an aim of showing the recent progress on the various methods used
to optimize them, all geared towards efficient and low cost solar cells for PV
applications
