Influence of Sn doping ratio on the structural and optical properties of CdO films prepared by laser induced plasma

Abstract EN

In this work, we study the effect of doping Sn on the structural and optical properties of pure cadmium oxide films at different concentrations of Tin (Sn) (X=0.

1, 0.

3 and 0.

5).

The films prepared by using the laser-induced plasma at wavelength of laser 1064 nm and duration 9 ns under pressure reached to 2.

5×10-2 mbar.

The results of X-ray diffraction tests showed that the all prepared films are polycrystalline.

As for the topography of the films surface, it was measured using AFM, where the results showed that the grain size increases with an increase in the percentage of doping in addition to an increase in the average roughness.

The optical properties of all films have also been studied through the orbance spectrum of the range of the wavelength (350- 1100) nm, where the optical energy gap was direct transitions it was found that the value of the optical energy gap increased with increasing the doping This increase can be interpreted as a result of the so-called Borsstein-Moss displacement, because because the lower levels of the conduction beams are full of electrons, the electrons need more energy to travel, so it seems as if the energy gap increases.