Effect of deposition temperature and Zn composition on structure, optical and electrical properties of CdO thin films
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Cd1−xZnxO nanocrystallite films with doping concentrations varied from x = 0.00–0.90 were synthesized through a simple chemical route of the spray pyrolysis process using 0.05M precursor solution. The suitable optimized temperatures for different compositions films were obtained by adjusting deposition temperatures from 693 to 723 K. It was found that structures, surface morphology, optical and electrical properties of the films can be altered by changing Zn contents in CdO deposits. The film composition from x = 0 to 0.50 have shown cubic phase with (1 1 1) prominent plane and the composition x = 0.90 shown wurtzite structure with (1 0 1) prominent plane. However, the composition varied from x = 0.60 to 0.80, in the deposits which showed mixed structure of cubic and wurtzite. The crystallite size, dislocation density and microstrain have been evaluated using XRD data. Scanning electron microscope images have shown different surface morphologies for different Zn doped CdO films. The absorption edge was found to be a blue shift with the increase of Zn content, confirming that there is an increase in the optical band gap. Other optical parameters such as extinction coefficient, Urbach energy, and optical conductivity have estimated using absorption spectra. All films show n-type conductivity, and it decreases with increasing Zn content due to decreasing carrier concentration.
One of the authors (SJ) would like to thank Manipal University for granting junior research fellowship and providing experimental facilities. The authors thank UGC-DAE Consortium for Scientific Research, Mumbai Center India for sanctioning research projects (UDCSR/MUM/AO/CRS-M-212/2015/511).
- 7.K.S. Hwang, Y.J. Lee, S. Hwangbo, Growth, structure and optical properties of amorphous or nano-crystalline ZnO thin films prepared by prefiring-final annealing. J Ceram. Process. Res. 8, 305–311 (2007)Google Scholar
- 10.K.L. Chopra, S. Ranyan, Das, Thin Film Solar Cells (Plenum Press, New York, 1993)Google Scholar
- 11.A. Srivastava, R.K. Shukla, K.P. Misra, Photoluminescence from screen printed ZnO based nanocrystalline films. Cryst. Res. Technol. 46, 949–955 (2011)Google Scholar
- 33.H. Czichos, T. Saito, L. Smith. Handbook of Materials Measurement Methods, vol. 978 (Springer, Leipzig, 2006)Google Scholar
- 37.M. Ali Yıldırım, Sümeyra Tuna Yıldırım, Aytunç AteşCadmium concentration effect on structural, optical and electrical properties of nanostructured CdxZn1–xO thin films. J. Alloys Compd. 17, 30112–30113 (2017)Google Scholar