1. Department of General Systems Studies, Graduate School of Arts and
Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan
2. Freiburg
Center
for Interactive Materials and Bioinspired Technologies, Laboratory
for Photovoltaic Energy Conversion, Department of Sustainable Systems Engineering, University of Freiburg, Georges-Köhler-Allee 105, Freiburg 79110, Germany
3. Research Center for Advanced Science and Technology, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8904, Japan