Patent ID: 8610129

Claim:
An image sensor comprising: a multi-layered I-III-VI-based photoelectric conversion unit which absorbs light of wavelength bands in steps; and a substrate which supports the multi-layered I-III-VI-based photoelectric conversion unit, wherein the multi-layered I-III-VI-based photoelectric conversion unit comprises: a first photoelectric conversion unit including a I-III-VI-based material layer which absorbs light of a first wavelength band; a second photoelectric conversion unit including a I-III-VI-based material layer which absorbs light of a second wavelength band longer than the first wavelength band; and a third photoelectric conversion unit including a I-III-VI-based material layer which absorbs light of a third wavelength band longer than the second wavelength band, and wherein the first photoelectric conversion unit includes a CuGaS 2 layer, the second photoelectric conversion unit includes a CuGa (1-x) Fe x S 2 layer (0.059≦x≦0.069), and the third photoelectric conversion unit includes a CuGa (1-y) Fe y S 2 layer (0.123≦y≦0.133).