1. Group for Molecular Engineering of Functional Materials and Laboratory for Photonics and InterfacesEPFL VALAIS CH-1950 Sion Switzerland
2. Photovoltaic Materials GroupCenter for Green Research on Energy and Environment MaterialsNational Institute for Materials Science 1-2-1 Sengen Tsukiba Ibaraki 305-0047 Japan
3. College of Science and TechnologyNihon University 1-8-14 Kanda Surugadai, Chiyoda-ku Tokyo 101-8308 Japan