1. Photonics and Electronics Thin Film Lab, Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, South Korea
2. Optoelectronics Convergence Research Center and Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 61186, South Korea
3. Computational Electronics and Nanoscience Research Laboratory, School of Nanoscience and Biotechnology, Shivaji University, Kolhapur 416004, India
4. Department of Electronics, Shivaji University, Kolhapur 416004, India
5. Dr. Homi Bhabha State University, 15, Madam Cama Road, Mumbai 400032, India