(JP8107225-A)      The solar cell includes a structure with a sequentially laminated transparent electrode layer, thin film semiconductor layer and back electrode layer on an insulating transparent substrate. The back electrode layer comprises a transparent conductive metal compound layer (e.g. tin oxide) with a lower refractive index than the semiconductor which constitutes the thin film semiconductor layer. Cadmium sulphide is used for the transparent conductive metal compound layer.    A second thin film solar cell has a sequentially laminated transparent electrode layer, thin film semiconductor layer and back electrode layer on an insulating transparent substrate. The back electrode layer comprises a laminate of an intermediate thin layer containing silver, oxygen and constituent metal elements of a transparent conductive metal oxide and a silver thin film, and zinc is particularly suitable for the constituent metal element of the transparent conductive metal oxide.    ADVANTAGE -   Has improved bonding strength and reflectivity of back electrode layer.    (JP8107228-A)      The solar cell includes a structure with a sequentially laminated transparent electrode layer, thin film semiconductor layer and back electrode layer on an insulating transparent substrate. The back electrode layer comprises a transparent conductive metal compound layer (e.g. tin oxide) with a lower refractive index than the semiconductor which constitutes the thin film semiconductor layer. Cadmium sulphide is used for the transparent conductive metal compound layer.    A second thin film solar cell has a sequentially laminated transparent electrode layer, thin film semiconductor layer and back electrode layer on an insulating transparent substrate. The back electrode layer comprises a laminate of an intermediate thin layer containing silver, oxygen and constituent metal elements of a transparent conductive metal oxide and a silver thin film, and zinc is particularly suitable for the constituent metal element of the transparent conductive metal oxide.    ADVANTAGE -   Has improved bonding strength and reflectivity of back electrode layer.    (JP9087860-A)      The solar cell includes a structure with a sequentially laminated transparent electrode layer, thin film semiconductor layer and back electrode layer on an insulating transparent substrate. The back electrode layer comprises a transparent conductive metal compound layer (e.g. tin oxide) with a lower refractive index than the semiconductor which constitutes the thin film semiconductor layer. Cadmium sulphide is used for the transparent conductive metal compound layer.    A second thin film solar cell has a sequentially laminated transparent electrode layer, thin film semiconductor layer and back electrode layer on an insulating transparent substrate. The back electrode layer comprises a laminate of an intermediate thin layer containing silver, oxygen and constituent metal elements of a transparent conductive metal oxide and a silver thin film, and zinc is particularly suitable for the constituent metal element of the transparent conductive metal oxide.    ADVANTAGE -   Has improved bonding strength and reflectivity of back electrode layer.    (US5828117-A)      The solar cell includes a structure with a sequentially laminated transparent electrode layer, thin film semiconductor layer and back electrode layer on an insulating transparent substrate. The back electrode layer comprises a transparent conductive metal compound layer (e.g. tin oxide) with a lower refractive index than the semiconductor which constitutes the thin film semiconductor layer. Cadmium sulphide is used for the transparent conductive metal compound layer.    A second thin film solar cell has a sequentially laminated transparent electrode layer, thin film semiconductor layer and back electrode layer on an insulating transparent substrate. The back electrode layer comprises a laminate of an intermediate thin layer containing silver, oxygen and constituent metal elements of a transparent conductive metal oxide and a silver thin film, and zinc is particularly suitable for the constituent metal element of the transparent conductive metal oxide.    ADVANTAGE -   Has improved bonding strength and reflectivity of back electrode layer.