OPTICAL PROPERTIES OF CdSe FILMS AT DIFFERENT THICKNESS AND ANNEALING TEMPERATURES

CdxSe1-x with(x=0.5) compound have been prepared as alloys successfully. The compound prepared was used to produce films CdSe films with different thickness (0.5, 1, 1.5, 2)mu m by heating evaporation on glass under vacuum (10(-5)) mbar with rate of deposition equal to 1.5 x 10(-3) mu m/sec. The deposited films on glass are examined at many temperatures (373, 423 and 473)K. XRD type of all cadmium selenide films indicated which these films are hexagonal crystalline and it has direction is (002). The average grain size in this direction is about (35.847)nm; the grain size increases with increasing thicknesses. The optical test founded CdSe films has optical energy gap (E-g (opt)), it reduce from (2.02) to (1.92) eV and from (2.02) to (1.74) eV associated with elevated temperatures of annealing (R.T - 473)K and thickness (0.5-2)mu m, respectively. The dielectric constants, optical constants refractive and extinction coefficient were investigated.