Inventors: Prof. Dr. Sabah Nuri Mizher, Assist. Lecturer Nuha Hassan Harb/Department of Physics, College of Science for Women, University of Baghdad
Assist. Prof. Dr. Ghusoon Hameed Ahmed, Prof. Dr. Kazim Abdul Wahid Adhim/Department of Physics, College of Science, University of Baghdad
Abstract
In this measurement, structural, optical, electrical properties of TiO2 (Nanocrytalline and CuO additive TiO2) were investigated. are successfully deposited on suitably cleaned glass substrate at constant room temperature, and different concentrations of CuO (0,5,10, 15,20)% wt. Pulse laser deposition(PLD) technique was used at a constant deposition parameter such as : (pulse Nd:YAG laser with λ=1064 nm, constant energy 800 mJ, repetition rate 6 Hz and No. of pulse was (500).The films were annealed at different annealing temperatures 423K and 523 K.
The XRD measurements show that as deposit TiO2:CuO thin films had polycrystalline structure, and XRD data of thin films coincided with tetragonal. The preferred orientation was along (110) direction for Rutile phase. The results show that the crystallite size increases with the increase of concentration of CuO and annealing temperature.
AFM measurements confirmed that the films have good crystalline and homogeneous surface. The Root Mean Square (RMS) values of thin films surface roughness and grain size increased with the increase of annealing temperature. The optical energy gap is calculated by two techniques UV-Visible spectrum and Photoluminescence(PL)spectrum. Both indicate that the energy gap decreased with the increase of concentration of CuO and annealing temperature.
By studying the electrical properties of TiO2:CuO thin film, D.c measurements show that the increase of CuO concentration in the prepared thin films increases the conductivity, while the activation energy(Ea1,Ea2decreases. Hall Effect measurements show that all films have n- type charge carriers and the increase of CuO concentration and annealing temperature lead to increase the concentration of charge carriers , while the mobility decreases. The process efficiency of the pure cells of the titanium oxide was increased from 1.12% to 2.138% by the copper oxide and different weight.