FIG. 3 Absorption and photocurrent action spectra of TiO<sub>2</sub> films supported on conducting glass. <strong>A</strong>, absorption efficiency of the bare TiO<sub>2</sub> film corrected for conducting glass background; <strong>B</strong>, absorption efficiency of the same film coated with a monolayer of <stong>1</strong>; full circles, monochromatic current yield at short circuit as a function of excitation wavelength. Yield is corrected for 15% loss of incident photons through light absorption and scattering by the conducting glass support.