Résumé:
This research aims to study the effect of chromium doping on the optical and
electrical properties of copper oxide thin films prepared using the spray pyrolysis
technique. Copper oxide thin films are considered promising materials for various
applications in optoelectronic and thermoelectric devices. Doping with elements
such as chromium can effectively enhance their optical and electrical properties,
making them suitable for different technological applications such as gas sensors,
solar cells, and display devices.
In this work, thin films of copper oxide doped with chromium (CuO:Cr) were
fabricated at different doping levels (0 at. %, 3 at. %, 6 at. %, 9 at. %, and
12 at. %) on glass substrates using spray pyrolysis and thermal decomposition
techniques. Solutions of copper chloride and chromium chloride were used to
prepare the necessary solutions. During the preparation, specific conditions were
maintained, such as substrate temperature and evaporation rate, to ensure the
formation of homogeneous films.
The results showed that increasing the chromium concentration significantly
affected the films’s properties. where the bandgap increased and the optical
absorption decreased with higher chromium doping levels. Additionally, the
study demonstrated that the doped CuO:Cr films exhibited good electrical
conductivity, making them suitable for various applications.
It is worth noting that factors such as solution concentration, thermal
treatment, and the substrate play a significant role in enhancing the films'
properties. Overall, the study concluded that doping with chromium is an
effective method to improve the performance of copper oxide thin films by
controlling the preparation conditions and chromium concentration to achieve the
best optical and electrical properties.
