THIN FILM SOLAR CELL

摘要

This invention relates to a thin film solar cell which improves bonding strength and reflectivity of a back electrode layer, and provides two kinds of structures. The first of them provides a thin film solar cell produced by sequentially laminating a transparent electrode layer, a thin film semiconductor layer and a back electrode layer on an insulating transparent substrate, wherein the back electrode layer comprises a first transparent conductive metal compound layer having a lower refractive index than the semiconductor that constitutes the thin film semiconductor layer, a second transparent conductive metal compound layer and a metal layer, and the second transparent conductive metal compound layer contains the constituent components of at least one of the first transparent conductive metal compound layer and the metal layer. Preferably, the first transparent conductive metal compound layer is made of a metal oxide, more concretely one of indium tin oxide, tin oxide and zinc oxide. When a compound semiconductor is used for the thin film semiconductor layer, cadmium sulfide can be used for the first transparent conductive metal compound layer. The second thin film solar cell is a thin film solar cell produced by sequentially laminating a transparent electrode layer, a thin film semiconductor layer and a back electrode layer on an insulating transparent substrate, wherein 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.