1. Research Institute for Science & Technology, Photovoltaic Science and Technology Research Division; Tokyo University of Science; SIC-2-206, 5-4-30 Nishihashimoto Sagamihara Kanagawa 252-0131 Japan
2. Showa Shell Sekiyu K. K.; 123-1, Shimokawairi Atsugi Kanagawa 243-0206 Japan