1. Department of Applied Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
2. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
3. Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Bredgatan 33, Norrköping 601 74, Sweden
4. Wallenberg Wood Science Center, Department of Science and Technology, Linköping University, Bredgatan 33, Norrköping 601 74, Sweden
5. Graduate School of Information, Production and Systems, Waseda University, Hibikino 2-7, Wakamatsu, Kitakyushu 808-0135, Japan