1. Department of Materials and Manufacturing Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
2. Department of Chemical and Biological Engineering, and Andlinger Center for Energy and the Environment, Princeton University, Princeton, New Jersey 08544, United States
3. Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
4. Photovoltaics Laboratory, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea
5. University of Science and Technology (UST), Daejeon 34113, Republic of Korea
6. Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea