There is a growing demand for cost-effective and high-performance thin-film photovoltaic solutions, thanks to the falling prices of their crystalline silicon (c-Si) counterparts. Copper-indium-(gallium)-diselenide (or/and sulfide) (CIGS) technology is regarded by some as the most promising thin-film PV contender to the c-Si due to its high conversion efficiencies, potential cost effectiveness and incrementally improving manufacturability.