Influence of Cu nanoparticles concentration on the electronic transition of pulsed laser deposited TiO2/ ZnO: Cu nanocoposite film

Abstract

The decoration energy band gap of metal oxide material was a key issues for important applications which has remarkable effects on the electronic transition. in this work, the structure and optical properties of titanium dioxide, zinc oxide and copper nanocoposite were studied. TiO2, ZnO and Cu were successfully deposited on a suitable glass substrate at room temperature using a pulsed laser deposition (PLD) technique N d: YAG laser with = 1064 nm wavelength at energy 500 mJ was used, concentrations of Cu = (4%, 8%, 12%, 16%, 20%). The surface topography was studied using atomic force microscopy (AFM) to ensure that the films had a homogeneous surface and that the minimum grain size obtained was 50.06 nm at 20% of Cu. The absorption spectrum was studied and observed that it increases with increasing in the ratio of Cu, and the energy gap decreases with the percentage of Cu and direct possible transitions in the range of 2.74 to 3.21 eV. Also the electrical properties was studied such as Hall effect and found that these films had of the charge n-type negative charge carriers.