1. Research
Center for Solar Energy Chemistry, Osaka University 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
2. Renewable Energy Material Development Group, Energy & Environment R&D Center, Corporate Research & Development, Asahi Kasei Corporation 1-3-1, Yakoh, Kawasaki-ku, Kawasaki, Kanagawa 210-0863, Japan