Résumé:
The aim of this work is the study of the effect of tin (Sn) doping and annealing on the optical and electrical
properties of copper oxide (CuO) thin films deposited by ultrasonic spray pyrolysis technique to obtain good
photoelectric properties it an important candidate in many technological applications.
In this work, we have prepared these films onto glass substrates with different Sn concentrations from 0 to 12 at.
% in the aqueous solution of copper (II) chloride dihydrate and tin (II) chloride dihydrate as precursors. Substrate
temperature, solution concentration, nozzle-substrate distance, and the deposition time were kept constant during the
whole deposition process.
These films were characterized, before and after annealing, using the UV-Visible-NIR Spectrophotometer and the
four-point method to determine their optical and electrical properties. All samples obtained have good physical
properties that varied with the doping percentage and the annealing.
It should be noted that increasing Sn doping in CuO films leads to an increase in thickness and optical band gap,
while the refractive index, optical transmittance, Urbach energy, and electrical conductivity decrease. On the other
hand, annealing reduces the thickness, band gap, Urbach energy, and optical transmittance, while increasing the
refractive index and electrical conductivity.
