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. IKG Punjab Technical University, Kapurthala, Punjab, India;
3. Yadavindra College of Engineering, Punjabi University, Guru Kashi Campus, Talwandi Sabo, Punjab, India;
4. Punjabi University Guru Kashi College (Damdama Sahib), Talwandi Sabo, Punjab, India;
5. Mata Sahib Kaur Girls College (affiliated to Punjabi University Patiala), Talwandi Sabo, Punjab, India