Spray-ILGAR indium sulfide buffers for Cu(In, Ga)(S, Se)2 solar cells

Thin-film indium sulfide buffer layers have been prepared using the Spray-ILGAR technique for use in chalcopyrite solar cells. Buffers deposited on commercially grown Cu(In,Ga)(S,Se)(2) absorbers have produced cells reaching a certified efficiency of 14.7% and average efficiencies matching the reference solar cells prepared with a conventional cadmium sulfide buffer layer. The process parameters have been optimized and the resulting cells have been studied using current-voltage and temperature-illumination-dependent current-voltage analysis as well as quantum efficiency measurements. Copyright (c) 2005 John Wiley & Sons, Ltd.