CORRELATION BETWEEN STRUCTURAL AND OPTICAL-PROPERTIES OF AMORPHOUS SELENIUM FILMS

Structural and optical properties of amorphous selenium films prepared by thermal evaporation are investigated. The structure of the films i s varied by deposition at various substrate temperatures. Parameters d escribing the structure of the films are obtained by X-ray diffraction and small-angle X-ray scattering measurements. Optical parameters are determined in the visible and near infrared spectral region. The stat ic refractive index and the temperature dependences of the Tauc gap an d the Tauc slope are measured. Drastic changes in the structural and o ptical properties in the films are found depending on the substrate te mperature. There is a good correlation between structural and optical parameters of the films.