Structural and optical properties of cualo2 thin film prepared by spray pyrolysis

Abstract EN

Transparent conducting oxides thin films of copper aluminium oxide (CuA1O2) were prepared by spray pyrolysis technique on a glass substrate at temperature (500oC).

The precursor solution was mixture of CuCl2 and anhydrous AlCl3 salts with different concentration (1:1), (1:2), and (2:1) of (Cu: Al) ratio.

It appears that from XRD spectra the pure delaffosite phase of CuAlO2 was dominate at the ratio (1:1).

UV-visible spectrum measurement showed highest absorption coefficient in the visible region at ratio (1:1).

The optical allowed direct and indirect band gap of thin films at ratio (1:1), (1:2) and (2:1) were estimated to be (2.9, 3, 2.6 and 1.2, 1.5, 1.4) eV respectively.

The extinction coefficient was also studied for different ratio.

The effective ratio is (1:1) for photoelectric application.