The Silver1Indium1Selenide (AgInSe2) (AIS) thin1films of (3001±20) nm thickness  have been1prepared2from the compound alloys2using thermal evaporation2 technique onto the glass2substrate at room temperature, with a deposition rate2(3±0.1) nm2sec-1. The2structural, optical and electrical3properties have been studied3at different annealing3temperatures (Ta=450, 550 and 650) K. The amount3or (concentration) of the elements3(Ag, In, Se) in the  prepared alloy3was verified using  an energy dispersive3x-ray spectrometer (EDS)3technology. X-ray diffraction3analysis shows that AIS alloy  prepared as (powder) and the thin films3are polycrystalline  of tetragonal3structure with preferential orientation3(112). The crystalline3size increases  as a function3of annealing temperature. The atomic force3microscope (AFM) technique  was used to examine3the  topography  and  estimate3the surface roughness, also the  average grain3size of the films. The results show3that the grain size increases3with annealing3temperature.   The optical4band gap of the films lies4in the range 1.6-1.9 eV. The films4appear to be4n-type indicating that the electrons4as a dominant charge4carrier. The electrical conductivity4increases  with a corresponding4increase in annealing4temperature.

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In this study, we are studying the effect of annealing temperature on   the structure and the optical properties of CdS:Cu thin films which were prepared by thermal evaporation technique in vacuum with rate deposition (4.1A°/sec) and thickness(=400nm),all these samples have been annealed at different annealing temperatures (RT,373,423 and 473 K). The structural properties of the films have been studied by using X-ray diffraction. The optical measurements indicate that CdS:Cu films have direct optical energy gap (E,""), and it decreases from 2.43 eV to 2.37 eV with the increase of annealing temperatures (R.T — 473)K. The optical constants refractive index (n), extinction coefficient (k),absorption coefficient (a) and dielectric constants (€, and €;) were also studied.

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