Affiliation: | aEco Technology Research Center, Sanyo Electric Co., Ltd., 1-1-1 Sakata, Oizumi, Ora, Gunma 370-0596, Japan;bDepartment of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan |