| 摘要 |
A CIGS film that can inhibit surface oxidation is provided, as is a CIGS solar cell that uses said CIGS film to minimize decreases and variability in conversion efficiency. Said CIGS film, which is used as a light-absorbing layer in said CIGS solar cell, has the following regions: a first region in which a Ga/(In+Ga) ratio gradually decreases with increasing distance from the bottom surface of the CIGS film, up to a prescribed first thicknesswise position; a second region in which the Ga/(In+Ga) ratio gradually increases with increasing distance from the first region, up to a prescribed second thicknesswise position; and a third region in which the Ga/(In+Ga) ratio gradually decreases from the top of the second region to the top surface of the CIGS film. |
