1. New & Renewable Energy Research Center, Korea Electronics Technology Institute, Seong-Nam 13509, Republic of Korea
2. Display Research Center, Korea Electronics Technology Institute, Seong-Nam 13509, Republic of Korea
3. Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju 61186, South Korea
4. Solar Energy R&D Department, Green Energy Institute, Mokpo 58324, South Korea