Michael Grätzel
Nature 2001, 414, 338
and the first paper:
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
Brian O’Regan, Michael Gratzel
Nature 1991, 353, 737
and a following paper:
Solid-state dye-sensitized mesoporous TiO2 solar cell with high photon-to-electron conversion efficiencies
U. Bach, D. Lupo, P. Comte, J.E. Moser, F. Weissortel, J. Salbeck, H. Spreitzer & M. Gratzel
Nature 1998, 395, 583
and the recent paper:
Highly Efficient and Thermally Stable Organic Sensitizers for Solvent-Free Dye-Sensitized Solar Cells
Hyunbong Choi, Chul Baik, Sang Ook Kang, Jaejung Ko,* Moon-Sung Kang, Md. K. Nazeeruddin,* and Michael Gratzel
 Angew. Chem. Int. Ed. 2008, 47, 327 –330