Cu2ZnSn(S,Se)4 from CuxSnSy nanoparticle precursors on ZnO nanorod arrays

► CuxSnSy nanoparticles are deposited on ZnO nanorod arrays. ► Samples are annealed at different temperatures (300-550 °C) in Se/Ar-atmosphere. ► Raman spectroscopy, X-ray diffraction and electron microscopy are performed. ► ZnO disappears with increasing annealing temperature. ► With increasing temperature CuxSnSy and ZnO form Cu2ZnSn(S,Se)4.