NOVELTY - The device has a transparent conducting substrate (4) covered with a titanium oxide based non-porous layer (5). A titanium oxide based nanocrystalline porous layer (1) is disposed on the substrate. An absorber material layer (2) is disposed on the surface of the nanocrystalline porous layer. A nickel oxide based p type-transparent semiconductor filling or covering (3) covers the absorber layer present inside the nanocrystalline layer.    USE - Used as a domestic photovoltaic generator on a roof of a house for a large surface panel, and for a battery, a cell and an electrochrome device.    ADVANTAGE - The usage of the titanium oxide based nanocrystalline porous layer improves the photovoltaic performance, allows having large sized pores, and permits a better deposit of the absorber, while preserving the roughness factor of the absorber layer above 50 and conferring a better covering of the semiconductor. The absorber layer has a maximum absorption of radiation greater than 50 percent, even greater than 80-90 percent, in a wide range of wavelengths above 400 nanometers and an absorption onset located between 650 and 1100 nanometers, while preserving a high porosity of the end layer. The usage of the cadmium sulfide absorber layer allows having a better performance, a photovoltaic efficiency greater than 1 percent, and a high quantum efficiency. The absorber layer presents a photovoltaic performance for a radiation of 1000 watts per square meter, with a better form factor and high photovoltages. The nickel oxide covering increases the photostability of the device for a photovoltaic application. The device has voltage/current curves with a high form factor closer to 1, and can be fabricated at low cost.    DETAILED DESCRIPTION - The absorber material layer is selected from cadmium sulfide, bismuth sulfide, tin sulfide, molybdenum sulfide, copper sulfide, and cobalt oxide. An INDEPENDENT CLAIM is also included for a method to prepare a solid photovoltaic device.    DESCRIPTION OF DRAWING(S) - The drawing shows a solid photovoltaic device with three main components with a nanocrystalline interpenetrated configuration.    Titanium oxide based nanocrystalline porous layer (1)    Absorber material layer (2)    Nickel oxide based p type-transparent semiconductor filling or covering (3)    Transparent conducting substrate (4)    Titanium oxide based non-porous layer (5)