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We report a new cosensitization utilizing quantum dot (QD) PbS and Cis-(SCN)2Bis(2,2-bipyridyl-4,4-dicarboxylate)ruthenium (N3) dye on the nanoporous TiO2 film. Solid-state Gratzel solar cells with the cosensitized films show an improved overall efficiency by 200% relative to the cells assembled with only N3 sensitization and an extremely high open-circuit voltage of 840mV, and a fill factor of 70.5%. Back reaction characteristics of the above cells are also investigated, demonstrating a great suppression of recombination due to cosensitization. It seems that the cosensitization also facilitates the electron injection into the conduction band of TiO2.