A simple solution-based approach for depositing CIGS (Cu–In–Ga–Se/S) absorber layers is discussed, with an
emphasis onfilm characterization, interfacial properties and integration into photovoltaic devices. The process
involves incorporating all metal and chalcogenide components into a single hydrazine-based solution, spin
coating a precursor film, and heat treating in an inert atmosphere, to form the desired CIGS film with up to
micron-scaled film thickness and grain size. PV devices (glass/Mo/CIGS/CdS/i-ZnO/ITO) employing the spincoated CIGS and using processing temperatures below 500 °C have yielded power conversion efficiencies of up
to 10% (AM 1.5 illumination), without the need for a post-CIGS-deposition treatment in a gaseous Se source or a
cyanide-based bath etch. Short-duration low-temperature (Tb200 °C) oxygen treatment of completed devices
is shown to have a positive impact on the performance of initially underperforming cells, thereby enabling
better performance in devices prepared at temperatures below 500 °C.