CuInS2 Solar Cells Prepared by a Sequential Process Using Sulphur Vapour

CuInS₂ absorber layers and solar cells are fabricated without toxic gas using a two step process. Sputtered copper and indium precursors are reacted to CuInS₂ in elemental sulphur vapour. After sulphurization two types of absorber layers with both, different absorption edges and sub-bandgap transitions are obtained as confirmed by electroreflectance and quantum efficiency measurements. Solar cells with total area efficiencies of 9.8 % have been fabricated.