FIZIKA A 1 (1992) 3, 189-195

OPTICAL PROPERTIES OF CADMIUM TELLURIDE THIN FILM IN THE INFRARED REGION

ABDEL HAMID EID, SIHAM MAHMOUD and MAGDA M.SAYED
Physics Department, National Research Centre, Cairo, A.R.E.

Received 4 December 1990

The values of refractive index, extinction coefficient, dielectric constant, optical conductivity and some physical data of cadmium telluride film were estimated in the infrared region using transmission technique. The transmission is closed to 70%. The index of refraction was determined to be » 2.65 and the extinction coefficient is very small. The value of 0.2 for the reflectivity coefficient R was obtained by plotting transmission against thickness for various wavelengths and extrapolating to zero thickness. It is seen that our values are in a satisfactory agreement with those given in the literature. The results show the presence of a maximum in e₁, e₂, a and s₁ at about 0.06, 0.08 and 0.197 eV. These peaks may be attributed to transitions from the valence band to an acceptor level.

UDC 538.958

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