1. Center for Green Research on Energy and Environmental Materials, National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
2. NIMS-SoftBank Advanced Technologies Development Center, National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
3. Advanced Technology Division, Technology Strategy Unit, Technology Unit, SoftBank Corp., 1-9-1 Higashi-Shinbashi, Minato-ku, Tokyo 105-7317, Japan