1. Research Center for Advanced Science and Technology The University of Tokyo 4-6-1 Komaba Meguro-ku 153-8904 Tokyo Japan
2. Open Instruments Pty Ltd. Suite 6387, Bld F22, Ground Floor, UNSW Library Walk Kensington NSW 2033 Australia
3. School of Photovoltaic and Renewable Energy Engineering The University of New South Wales Sydney NSW 2052 Australia
4. Faculty of Engineering University of Miyazaki 1-1 Gakuen-kibanadai-nishi 889-2155 Miyazaki Japan
5. Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku 113-8654 Tokyo Japan