A transparent titanium dioxide (TiO2) film of thickness 1 mu m has been prepared by speading colloidal particles on a conducting glass support. Atomic force microscope analysis reveals that the film is composed of interconnected particles and pores. The roughness factor of the TiO2 microporous electrode is determined to be 50 by an absorption spectroscopy study. Sensitization of electrode with phthalocyanine molecules extends the absorbance of the electrode into the visible region. At 690 nm, the incident-photon-to-current-conversion efficiency is about 4%, one of the highest ever reported for phthalocyanine photovoltaic cells.