1. School of Photovoltaic and Renewable Energy Engineering University of New South Wales Sydney NSW 2052 Australia
2. Changzhou Fusion New Materials Co., Ltd Shanghai 213031 China
3. Toyo Aluminium K.K. 341‐14 Higashiyama, Ohtani, Hino‐Cho, Gamo‐Gun Shiga 529‐1608 Japan
4. Graduate School of Engineering Osaka University Suita 565‐0871 Japan