WO200181244-A2  GRATZEL ET AL.: 'A Low-cost, High Efficiency Solar Cell Based on Dyesensitized Colloidal TiO2 Films"' NATURE vol. 353, 24 October 1991, pages 737 - 738;  WANG Y ET AL: "PREPARATION, CHARATERIZATION AND PHOTOELECTROCHEMICAL BEHAVIORS OF FE(111)-DOPED TIO2 NANOPARTICLES" JOURNAL OF MATERIALS SCIENCE, CHAPMAN AND HALL LTD. LONDON, GB, vol. 34, no. 15, 1 August 1999 (1999-08-01), pages 3721-3729, XP000851668 ISSN: 0022-2461;  ZHANG Q-H ET AL: "Preparation and characterization of nanosized TiO2 powders from aqueous TiCl4 solution" NANOSTRUCTURED MATERIALS, ELSEVIER, NEW YORK, NY, US, vol. 11, no. 8, November 1999 (1999-11), pages 1293-1300, XP004203107 ISSN: 0965-9773US6444189-B1  Mosaddeq-ur-Rahman, Md. et al., Investigation of solid state Pb doped TiO2 solar cell, Solar Energy Materials and Solar Cells, 48, 123-130, 1997.;  Music, S. et al., Chemical and microstructural properties of TiO2 synthesized by sol-gel procedure, Materials Science and Engineering, B47, 33-40, 1997.;  Nazeeruddin, M.K., et al.,, Conversion of Light to Electricity by cis-X2Bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) Charge-Transfer Sensitizers (X=CL-,Br-, I-, CN-, and SCN-) on Nanocrystalline TiO2 Electrodes, J. Am. Chem. Soc., 115, 6382-6390, 1993.;  O'Regan, B. et al., A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films, Nature, 353, 737-739, Oct. 24, 1991.US6720202-B2  Cheng et al, Chem. Mater., 1995, vol. 7, pp. 663-671.*;  International Search Report for PCT/US01/13384, Apr. 29, 2002.;  Mosaddeq-ur-Rahman, Md. Et al., Investigation ofsolid state Pb doped TiO2 solar cell, Solar Energy Materials and Solar Cells, 48, 123-130, 1997.;  Music, S. et al., Chemical and microstructural properties of TiO2 synthesized by sol-gel procedure, Materials and Science and Enginerring, B47, 33-40, 1997.;  Nazeeruddin, M.K., et al., Conversion of Light to Electricity by cis-X2Bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) Charge-Transfer Sensitizers (X=CL-, Br-, CN-, and SCN-) on Nanocrystalline TiO2 Electrodes, J. Am. Chem. Soc., 115, 6382-6390, 1993.;  O'Regan, Brian, A low-cost, high efficiency solar cell based on dye-sensitized colloidal TiO2 films, Institute of Physical Chemistry, Nature, (Oct. 1991), vol. 353, Lausanne, Switzerland.