1. Department of Physics, University of Kotli Azad Jammu and Kashmir, Kotli 11100, Pakistan
2. Department of Physics, University of Azad Jammu and Kashmir, Muzaffarabad 13100, Pakistan
3. Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
4. National Institute of Lasers and Optronics College, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan
5. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia