1. Research Association for Technology Innovation of Organic Photovoltaics (RATO), Komaba 4-6-1, Meguro-ku, Tokyo 153-8904, Japan
2. 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
3. Research Center for Advanced Science and Technology, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8904, Japan