Abstract

The ternary systems of Cd_1-xMn_xTe were synthesized by direct fusion technique. Thin films of these compounds were prepared by electron beam gun under vacuum of 10^-5 Torr. The structural properties of these compounds in thin film forms were investigated by X-ray diffraction. It was found that materials crystallize in the zinc-blende form. The optical constants (absorption coefficient and band gap) of the thin films were determined by measurements of reflectance and transmittance in the wavelength region from 500 to 2500 nm. Analysis of the optical absorption spectra revealed the existence of one direct energy gaps. The energy gaps increase as the Mn concentration increases and the annealing temperature decreases. It is observed that as the Mn content (x) increases, the conductivity decreases.

Key words: Structure, optical properties, dilute magnetic semiconductor, Cd_1-xMn_xTe thin films.