THIN-FILM SOLAR CELL AND PRODUCTION METHOD FOR THIN-FILM SOLAR CELL

摘要

A thin-film solar cell comprising a substrate (11), a first electrode layer (12) arranged upon the substrate, a p-type light absorption layer (13) formed by a group I-III-VI 2 compound arranged upon the first electrode layer (12), and an n-type second electrode layer (15) arranged upon the p-type light absorption layer (13). The p-type light absorption layer (13) includes Cu as a group 1 element and includes Ga and In as group III elements. The ratio of the atomic number between Cu and the group III elements in the entire p-type light absorption layer (13) is lower than 1.0; the ratio of the atomic number between Ga and the group III elements in the surface on the second electrode layer (15) side is no more than 0.13; and the ratio of the atomic number between Cu and the group III elements in the surface on the second electrode layer (15) side is at least 1.0.