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 is varied by deposition at various substrate temperatures. Parameters describing 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 static refractive index and the temperature dependences of the Tauc gap and the Tauc slope are measured. Drastic changes in the structural and optical properties in the films are found depending on the substrate temperature. There is a good correlation between structural and optical parameters of the films.