Effect of Switching the Preparation Solution for CdSe Films by (CBD) Method on, Thickness, Optical and Structure Properties of the Films.

In this work, cadmium selenide (CdSe) thin films were prepared by two methods of chemical bath deposition (CBD) on glass substrate, where cadmium nitrate Cd (NO3)2 and sodium selenosulfite Na2SeSO3 were used. The deposition conditions at 70 oC temperature and for 6 hours and pH = 9 (during deposition). In the first method the deposition solution was changed every two hours, while the deposition continued without changing the solution in the second method. It was found that switching the solution affects the value of the thickness of the deposition film which increase too about double. The energy gap was reduced by 0.2eV when the solution was switched. As for (XRD) of the films prepared by the solution switched appeared polycrystalline, a hexagonal and cubic structure and growing in (002) direction. A hexagonal crystal with growth in the (002) direction in which the solution was not changed. The (SEM) of the prepared films found that they have spherical, sheets, and flower clusters nano-shapes distributed on the surface.