NOVELTY - Single crystal silicon solar cell (31) comprises successively: transparent insulator substrate (12), transparent electroconductive film (16), single crystal silicon layer (17) in which a p-n junction is formed, and electrode (23). It is produced by implanting hydrogen ions and/or rare gas ions into single crystal silicon substrate; forming a transparent electroconductive film; conducting a surface activating treatment; bonding ion implanting surface of the single crystal silicon substrate and surface of transparent electroconductive film; and applying impact to ion implanted layer.    USE - Single crystal silicon solar cell i.e. see-through type solar cell for use as a natural lighting window material of a house.    ADVANTAGE - Light conversion layer is provided as thin-film for effective utilization of silicon as a starting material of the silicon solar cell. The single crystal silicon solar cell is excellent in conversion characteristics and is less in degradation due to light irradiation. Since the single crystal silicon substrate and the transparent insulator substrate formed with the transparent electroconductive film are bonded to each other after the surface activating treatment, both substrates can be strongly bonded to each other. This results in a sufficiently strong joining, without applying a high-temperature heat treatment for increasing a bonding force. Since the joining surfaces are strongly joined to each other in this way, it becomes possible to subsequently apply an impact to the ion implanted layer to mechanically delaminate the single crystal silicon substrate, forming a thin single crystal silicon layer on the transparent insulator substrate. Thus, the single crystal silicon thin film can be obtained, even without conducting heat treatment for delamination. The formation of the single crystal silicon layer acting as the light conversion layer is achieved by the delamination from the single crystal silicon substrate, enabling an enhanced crystallinity of the single crystal silicon layer. This enables an enhanced conversion efficiency of the solar cell. The delamination of the single crystal silicon substrate for formation of the single crystal silicon layer is conducted as mechanical delamination without relying on heating, enabling suppression of introduction of cracks and defects into the light conversion layer due to a difference of thermal expansion coefficient. The solar cell is made to be a thin-film solar cell having thin layer of silicon, thus, saving and effectively utilizing the silicon material. It is possible to see a situation in a room by looking through the see-through type solar cell while allowing outside light to enter the room during a fine day.    DETAILED DESCRIPTION - Single crystal silicon solar cell (31) comprises successively: transparent insulator substrate (12), transparent electroconductive film (16), single crystal silicon layer (17) in which a p-n junction is formed, and electrode (23). It is produced by preparing transparent insulator substrate and single crystal silicon substrate having first conductivity type; implanting hydrogen ions and/or rare gas ions into the single crystal silicon substrate through its ion implanting surface to form an ion implanted layer in the single crystal silicon substrate; forming a transparent electroconductive film on a surface(s) of the transparent insulator substrate; conducting a surface activating treatment for the ion implanting surface of the single crystal silicon substrate and/or surface of the transparent electroconductive film on the transparent insulator substrate; bonding the ion implanting surface of the single crystal silicon substrate and the surface of the transparent electroconductive film on the transparent insulator substrate to each other; applying an impact to the ion implanted layer to mechanically delaminate the single crystal silicon substrate to leave a single crystal silicon layer; forming a diffusion layer having a second conductivity type in the single crystal silicon layer, which conductivity type is different from the first conductivity type, in a manner that a p-n junction is formed in the single crystal silicon layer; and forming an electrode on the single crystal silicon layer.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view illustrating the production of single crystal silicon solar cell.    Transparent insulator substrate (12)    Transparent electroconductive film (16)    Single crystal silicon layer (17)    Electrode (23)    Single crystal silicon solar cell (31)