... (December 2009.) pp .11 5 -11 6 Investigation of Dyes for Dye- Sensitized Solar Cells: Ruthenium-Complex Dyes, Metal-Free Dyes, Metal-Complex Porphyrin Dyes and Natural Dyes Seigo Ito Department of Electrical ... Investigation of Dyes for Dye- Sensitized Solar Cells: Ruthenium-Complex Dyes, Metal-Free Dyes, Metal-Complex Porphyrin Dyes and Natural Dyes 19 Seigo Ito Chapter Comparative Study of Dye- Sensitized Solar ... M (19 91) Letters to nature, Vol.353, pp 733-740 Nagayama, H., Honda, H & Kawahara., H (19 88) Journal of the Electrochemical Society, Vol .13 5, pp 2 013 -2 014 18 Solar Cells – Dye- Sensitized Devices...