1. Optoelectronics
Convergence Research Center and Department of Materials Science and
Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 500-757, South Korea
2. Gwangju Institute of Science and Technology, Cheomdangwagi-ro, Buk-Gu, Gwangju 500-712, South Korea
3. Thin
Film Nanomaterials Laboratory, Department of Physics, Shivaji University, Kolhapur 416004, Maharashtra, India
4. Photovoltaic
Laboratory, Korea Institute of Energy Research (KIER), Daejeon 305-343, South Korea