1. Department
of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom
2. Department
of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
3. Gasp Solar ApS, Gregersensvej
7, Taastrup DK-2630, Denmark
4. Department
of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom