Structural and optical properties of CuInS(2) bulk crystals

Photoreflectance and photoluminescence analyses facilitate the determination of the optical properties of CuInS2 and the comparison of the structural properties derived by energy dispersive X-ray microprobe analysis and X-ray diffraction. Transitions in the photoreflectance spectra are due to Wannier excitons. Field-induced change of the excitonic dielectric function explains these transition. Small inhomogeneities in the molecularity of the compound do not affect photoluminescence.