1. Department of Physics Meenaakshi Ramasamy arts & Science college (Affiliated ‐Bharathidasan University), Thathanur Jayankondam Tamil Nadu India
2. Department of Physics Manonmaniam Sundaranar University Constituent College of Arts and Science Kanyakumari Tamil Nadu India
3. Research Centre for Solar Energy, Department of Engineering Physics College of Engineering, Koneru Lakshmaiah Education Foundation, Green Fields, Vaddeswaram Guntur Andhra Pradesh India