Photovoltaic cell comprises: (a) an electrically conductive element to which one or more titanium dioxide layers have been applied; (b) a solid electrolyte; and/or (c) an electrically conductive element through which light can pass to the TiO2 layer.    Alternatively a photvoltaic cell comprises: (a1) a cylindrically conductive element (e.g, a textile conductive filament or a wire e.g, copper wire) on to which one or more titanium dioxide layers have been applied; (b1) a solid electrolyte that has been applied concentrically around (a1); and/or (c1) a light transmitting electrically conductive polymer through which light can pass to the TiO2 layer, that has been applied concentrically around (a1).    Alteratively a photovoltaic cell comprises: (a) an electrically conductive element; (b) opt. a solid electrolyte; and/or (c) a intrinsically conductive polymer (with no TiO2 coating) which contacts the TiO2 layer of the first electrode (or the electrolyte if present), whereby the visible light transmittance of at least the polymer is at least 60%.    USE/ADVANTAGE -   For conversion of visible light to electric emergy. When solid electrolyte is present, the use of fluid electrolyte is avoided, bringing a good long term light fatness and avoiding the deterioration of the first electrode and of the electrodes of the integrated cells. The cells provide a better overall stability than systems of prior art. With this system, it is possible to build very thin and flexible solar cells that could be adapted easily to any form. The photovoltaic coaxial cell may also have the following advantages: (a) the cell will be automatically integrated by a simple and periodic isolation of the wires; (b) the cell avoids the need for conductive wire on the surface of the cell between the modules, making it cheaper to make; (c) the cell can be produced continuously; (d) there is increased use for the cell due to adaptability to any surface; (e) it may be a more efficient cell; and (f) it may have improved heat dissipation.