1. Department of Materials Engineering and Convergence Technology Research Institute for Green Energy Convergence TechnologyGyeongsang National University 501 Jinju-daero Jinju 52828 Republic of Korea
2. Department Solar & Energy EngineeringCheongju University Cheongju Chungbuk 360–764 Republic of Korea
3. Department of PhysicsChalmers University of Technology 412 96 Göteborg Sweden