1. Materials Science Laboratory, Department of Applied Physics, Giani Zail Singh Campus College of Engineering and Technology, MRS Punjab Technical University, Bathinda, Punjab, India;
2. Department of Applied Sciences, IKG Punjab Technical University Jalandhar-Kapurthala Highway, Kapurthala, Punjab, India;
3. Department of YCoE, Punjabi University Guru Kashi Campus, Talwandi Sabo, Punjab, India;
4. Department of Physics, Punjabi University Guru Kashi College Damdama Sahib, Talwandi Sabo, Punjab, India;
5. Department of Physics, Mata Sahib Kaur Girls College (affiliated to Punjabi University Patiala), Talwandi Sabo, Punjab, India