1. Research Institute for Science & Technology, Photovoltaic Science and Technology Research DivisionTokyo University of Science SIC‐2‐206, 5‐4‐30 Nishihashimoto Sagamihara Kanagawa 252‐0131 Japan
2. Solar Frontier K.K. 123‐1 Shimokawairi Atsugi Kanagawa 243‐0206 Japan