NOVELTY - Manufacturing a single crystal silicon solar cell (31) involves bonding a single crystal silicon substrate and a transparent insulator substrate (12) via a transparent adhesive (16); mechanically delaminating silicon substrate to form a single crystal silicon layer (17); forming diffusion areas (22) of second conductivity type in delaminated surface side of silicon layer, and causing areas (21) of first conductivity type and areas of second conductivity type to be present in delaminated surface; and forming each of electrodes (23, 24) on each area of first and second conductivity types.    USE - For forming a single crystal silicon solar cell (claimed).    ADVANTAGE - The thin-film single crystal silicon solar cell uses the single crystal silicon layer as a light-converting layer, and exhibits a high conversion efficiency relative to its thickness and reduced deterioration due to light irradiation. The single crystal silicon layer serving as a light-converting layer is formed by delamination of the single crystal silicon substrate, thus increasing the crystallinity of the single crystal silicon layer. As a result, the conversion efficiency of the solar cell can further be enhanced. The use of a transparent adhesive in bonding the single crystal silicon substrate and the transparent insulator substrate enables these two substrates to be firmly bonded. Therefore, sufficiently firm bonding can be obtained without the application of a high-temperature heat treatment to increase the bonding strength. Because the bonding surfaces are thus firmly bonded, an impact can be subsequently applied to the ion-implanted layer to mechanically delaminate the single crystal silicon substrate, thus forming a thin single crystal silicon layer on the transparent insulator substrate. Thus, the single crystal silicon layer can be made thin without any heat treatment for delamination. The single crystal silicon substrate is delaminated not by heating but by mechanical means to form a single crystal silicon layer, so as to prevent cracks or defects from being introduced in the light-converting layer due to a difference between the thermal expansion coefficients of the two substrates. The thin-film solar cell has a thin silicon layer, which saves the amount of the silicon raw material while allowing effective use of the material. The absence of any electrode on the light receiving surface side allows the light absorption efficiency at the single crystal silicon layer to increase, resulting in a further enhancement in the conversion efficiency of the solar cell. Because the method does not require heating a single crystal silicon solar cell to greater than or equal to 300 degrees C from the ion implantation step to the delamination step, there is no possibility that oxygen-induced defects are introduced into the single crystal silicon substrate. The thin-film single crystal silicon solar cell allows effective use of silicon as a raw material, exhibits excellent conversion characteristics, has reduced deterioration due to light irradiation, and exhibits a maximum efficiency relative to its thickness. The single crystal silicon solar cell is free of potential thermal strains, delamination, and cracks formed during the fabrication; and has a thin uniform thickness and single crystal silicon layer with excellent crystallinity.    DETAILED DESCRIPTION - Manufacturing a single crystal silicon solar cell (31) involves preparing a transparent insulator substrate (12) and a single crystal silicon substrate of a first conductivity type; implanting either hydrogen ions or rare-gas ions into the single crystal silicon substrate to form an ion-implanted layer; bringing the ion-implanted layer of single crystal silicon substrate in close contact with the transparent insulator substrate via a transparent adhesive (16); curing the transparent adhesive to form a transparent adhesive layer, and simultaneously, bonding the single crystal silicon substrate and the transparent insulator substrate; applying an impact to the ion-implanted layer to mechanically delaminate the single crystal silicon substrate, to form a single crystal silicon layer (17); forming several diffusion areas (22) of a second conductivity type in the delaminated surface side of the single crystal silicon layer to form several pn junctions, and causing several areas (21) of a first conductivity type and the areas of the second conductivity type to be present in the delaminated surface of the single crystal silicon layer; forming each of individual electrodes on each one of the areas of the first conductivity type and on each one of the areas of the second conductivity type in the single crystal silicon layer; forming a collector electrode for the individual electrodes on the areas of the first conductivity type, and a collector electrode for the individual electrodes on the areas of the second conductivity type; and forming a light-reflecting film (28) for covering the areas of the first conductivity type and the areas of the second conductivity type. The transparent adhesive layer is capable of scattering light. An INDEPENDENT CLAIM is included for a single crystal silicon solar cell comprising a stack having at least a light-reflecting film, a single crystal silicon layer, a transparent adhesive layer, and a transparent insulator substrate; several areas of a first conductivity type and several areas of a second conductivity type formed in a surface of the single crystal silicon layer near the light-reflecting film; several pn junctions formed at least in a plane direction of the single crystal silicon layer; several first individual electrodes, each being formed on each one of the areas of the first conductivity type in the single crystal silicon layer, and several second individual electrodes, each being formed on each one of the areas of the second conductivity type in the single crystal silicon layer; and a first collector electrode for connecting the first individual electrodes and a second collector electrode for connecting the second individual electrodes.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of single crystal silicon solar cell.    Transparent insulator substrate (12)    Transparent adhesive layer (16)    Single crystal silicon layer (17)    Areas of the first conductivity type (21)    Diffusion areas of a second conductivity type (22)    First individual electrodes (23)    Second individual electrodes (24)    Seal layer (27)    Light-reflecting film. (28)