NOVELTY - The hybrid photovoltaic cell device (10) comprises a composite substrate for receiving solar radiation comprising a first surface, a second surface disposed opposite to the first surface, an electron-accepting material characterized by nanoscopic holes and an organic electron-donating material disposed within some of the nanoscopic holes, an electrically conductive substrate proximate to the first surface, and an electrode proximate to the second surface. The electrically conductive substrate and electrode are in electrical communication with the composite substrate.    USE - The hybrid organic-inorganic photovoltaic cell device is useful for generating electrical energy.    ADVANTAGE - The hybrid organic-inorganic photovoltaic cell device is flexible and lightweight, and can be simply and economically manufactured with high stability and improved efficiency, performance and power conversion efficiency.    DETAILED DESCRIPTION - The hybrid photovoltaic cell device (10) comprises a composite substrate for receiving solar radiation comprising a first surface, a second surface disposed opposite to the first surface, an electron-accepting material characterized by nanoscopic holes and an organic electron-donating material disposed within some of the nanoscopic holes, an electrically conductive substrate proximate to the first surface, and an electrode proximate to the second surface. The electrically conductive substrate and electrode are in electrical communication with the composite substrate. The organic electron-donating material comprises a conjugated polymer polymerized within the nanoscopic holes from precursors, and a conjugated oligomer. The electron accepting material comprises a titanium oxide nanotube array (100) characterized by nanotubes. The electron donating material is disposed within some of the nanotubes. Each of the nanotubes has a radius of 100-200% of a distance characterized by the exciton diffusion distance. The device is arranged for producing a photocurrent density of 5 mu mA/cm2 in response to illumination by light having a wavelength of 620 nm. The precursors are present in part polymerized through irradiation by ultraviolet light. INDEPENDENT CLAIMS are included for:    (1) a composite substrate for a photovoltaic cell device; and    (2) a method for making a multilayer composite substrate.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a solid state solar cell.    Photovoltaic cell (10)    Nanotube array (100)    Top electrode (120)    Overlayer (130)    Glass substrate (140)    Titanium film. (150)