TIN SELENIDE (SNSE) THIN-FILMS PREPARED BY REACTIVE EVAPORATION

Polycrystalline thin films of tin selenide have been prepared by reactive evaporation at substrate temperatures ranging from 473-600 K. Crystallites of the films prepared at substrate temperatures below 525 K are randomly oriented, while they have a strong preferred orientation on the substrate surface at higher substrate temperatures. Optical absorption studies indicate that the fundamental absorption starts at 1.21 eV and it is due to an allowed direct transition.