(JP5504023-W)      Photovoltaic cell comprises light-transmitting electroconductive layer deposited on glass plate or transparent polymer sheet to which one or more pref. porous high surface-area Ti dioxide (TiO2) layers have been applied. The last TiO2 layer (and opt. also the second from last and third from last layers) is doped with a metal ion from a divalent or trivalent metal.    USE/ADVANTAGE -   Provides efficient solar energy cell, having higher efficiency than Si-based solar cell, and is able to convert diffuse light more efficiently. Can be irradiated from either side or both sides. Invented cell operates as a majority carrier device so that cell voltage depends less strongly on intensity of inpinging light    (US5350644-A)      Solar-light-responsive photovoltaic cell comprises a first electrode comprising (i) a light transmitting electrically conductive layer deposited on a glass plate or transparent polymer sheet; (ii) at least one porous, high surface area TiO2 layer applied to (i); (iii) a dopant selected from divalent or trivalent metal ions and B, applied to the outermost TiO2 layer and opt. to the 2nd and 3rd outermost layers; and (iv) a photosensitiser (O) applied to the dopant-contg. TiO2 layer, attached to the layer by interlocking gps. selected from carboxylate, CN, phosphate gps., and chelating gps. with conducting character selected from (di)oximes, hydroxy quinolines, salicylates and alpha-keto-enolates. The cell further comprises a second electrode and a means for permitting the output of an electrical current generated by the cell.    The photosensitiser is selected from e.g. (MCla)(Lg)(X)), where M = Ru, Os or Fe; La = e.g. opt. substd. 2,2'-bipyridyl by 1 or 2 CO2H gps.; opt. substd. 2,2'-biquinoline by 1 or 2 carboxy gps.; Lg = e.g. terpyridyl, opt. substd. phenyl by CO2H and dicarboxypyridine; and X = halo, H2O, CN, prim. and sec. alkylamine, and/or pyridine.    ADVANTAGE -   The photosensitising dyes can be coated on TiO2 films rendering such devices effective in the conversion of visible light to electrical energy.    (JP96015097-B2)      A photovoltaic cell comprises a light-transmitting electrically conductive layer deposited on a glass plate or a transparent polymer sheet to which one or more pref. porous high surface-area Ti dioxide (TiO2) layers have been applied. The last TiO2 layer (and opt. also the second from last and third from last layers) is doped with a metal ion from a divalent or trivalent metal.    USE/ADVANTAGE -   Provides efficient solar energy cell, having higher efficiency than Si-based solar cell, and is able to convert diffuse light more efficiently. Can be irradiated from either side or both sides. Invented cell operates as a majority carrier device so that cell voltage depends less strongly on intensity of impinging light.