NOVELTY - Producing electrical signal in response to incident light, comprises: providing transparent substrate (902); depositing first transparent conductive layer (904) on surface of transparent substrate; depositing first doped diamond layer (906) on first transparent conductive layer; depositing second doped diamond layer (908) on first doped diamond layer, first and second doped diamond layer form p-n junction and it is responsive to the incident light and converts incident light into the electrical signal; and depositing second transparent conductive layer (910) on second doped diamond layer.    USE - The method is useful for producing electrical signal in response to incident light (claimed).    ADVANTAGE - The potential difference developed at p-n junction due to exposure to the incident light create a current in a circuit.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a solar cell that is arranged to generate an electrical signal in response to incident light, comprising: a transparent substrate having a surface; a first transparent conductive layer coupled to the surface; a first doped diamond layer of a first type coupled to the first transparent conductive layer; a second doped diamond layer of a second type coupled to the first doped diamond layer, where the first doped diamond layer and the second doped diamond layer form a p-n junction that is arranged to generate the electrical signal responsive to a portion of the incident light; and a second transparent conductive layer coupled to the second doped diamond layer; and    (2) an apparatus that is arranged to generate an electrical signal in response to incident light, comprising the solar cell and an electrical system operably connected to the solar cell and arranged to receive the electrical signal.    DESCRIPTION OF DRAWING(S) - The figure illustrates the process of generating doped diamond solar cells.    Provide a transparent substrate having a surface (902)    Deposit a first transparent conductive layer on the surface of the transparent substrate (904)    Deposit a first doped diamond layer of a first type on the first transparent conductive layer (906)    Deposit a second doped diamond layer of a second type on the first doped diamond layer (908)    Deposit a second transparent conductive layer on the second doped diamond layer (910)