1. Department of Physics , Urgench State University , 220100 Urgench , Uzbekistan
2. National Centre for Nanoscience and Nanotechnology , University of Madras , 600 025 Chennai , India
3. College of Materials Science and Engineering , Sichuan University , 610065 Chengdu , China
4. Department of Physics , Karakalpak State University , 230112 Nukus , Karakalpakstan , Uzbekistan
5. Department for Solar Energy , Institute for Energy Technology , 2027 Kjeller , Lillestrøm , Norway