Effect of Ag-doping on the properties of ZnO thin films for UV stimulated emission

5^th World Congress on Smart and Emerging Materials

April 19-20, 2018 Dubai, UAE

Ahmed S Razeen, A-S. Gadallah and M. M. El-Nahass

Cairo University, Egypt
Ain shams University, Egypt

Scientific Tracks Abstracts: J Material Sci Eng

Abstract :

To attain UV stimulated emission, pure and Ag doped ZnO thin films were prepared by sol-gel spin coating process. Different preparation parameters were studied during fabrication, including precursor concentrations, aging time of solutions before deposition, number of layers, baking temperature and time, and annealing treatment conditions. Structural and morphological properties were studied by XRD and SEM measurements. XRD results showed that all the films are poly-crystalline with hexagonal wurtzite structure. SEM images revealed better homogeneity of Ag:ZnO films than pure films, with typical film thickness for all films of ~2.6 �?¼m. Photoluminescence measurements were done for all samples, which demonstrated the stimulated emission characteristics from pure and Ag doped ZnO films with doping concentration higher than 0.01M, with threshold pump intensities of ~23 MW.cm-2 and 18 MW.cm-2 for pure and doped thin films, respectively. The outputinput relation for these samples showed a kink positioned at the mentioned threshold intensities. The stimulated emission mechanism and the role of Ag doping in the stimulated emission process were discussed. References 1. Hameed M Shahul, J Joseph Princice, N Ramesh Babu and A Arunachalam (2017), â�?�?Effect of silver doping on optical properties of nanoflower ZnO thin films prepared by spray pyrolysis techniqueâ�?. Journal of Materials Science: Materials in Electronics; 28(12): 8675. 2. Y Zhang, Z Zhang, B Lin, Z Fu and J Xu (2005), â�?�?Effects of Ag doping on the photoluminescence of ZnO films grown on Si substratesâ�?. The Journal of Physical Chemistry B: 19200. 3. X B Wang, C Song, K W Geng, F Zeng and F Pan (2006), â�?�?Luminescence and Raman scattering properties of Ag-doped ZnO filmsâ�? J. Phys. D. Appl. Phys.; 39: 4992. 4. H Xue, X L Xu, Y Chen, G H Zhang and S Y Ma (2008), â�?�?Influence of Ag-doping on the optical properties of ZnO filmsâ�? Appl. Surf. Sci.; 255: 1806. 5. L Xu, G Zheng, L Zhao and S Pei (2015), â�?�?Two different mechanisms on UV emission enhancement in Ag-doped ZnO thin filmsâ�?. J Lumin.; 158: 396. Recent Publications 1. Ahmed S Razeen, A S Gadallah and M M El-Nahass (2017), â�?�?Ultraviolet Stimulated Emission from Sol-Gel Spin Coated ZnO Thin Filmsâ�?. Advances in Materials Science and Engineering; 2017: 1-7. Doi: 10.1155/2017/9464862 2. Ahmed S Razeen, A S Gadallah and M M El-Nahass (2018), â�?�?Effect of Ag doping on the properties of ZnO thin films for UV stimulated emissionâ�?. Physica B: Condensed Matter; 538:131. Doi: 10.1016/j.physb.2018.03.015.

Biography :

Ahmed S Razeen is a Teaching Assistant at the National Institute of Laser Enhanced Sciences (NILES), Cairo University. He had completed his MSc research in thin film fabrication focusing on the stimulated emission properties of ZnO thin films. He is interested in fabrication and characterization of new optical materials.
Email:a.razeen@niles.edu.eg