Patent ID: 8471301

Claim:
A device comprising: a plurality of photoelectric conversion regions; an interlayer insulating film arranged on the plurality of photoelectric conversion regions; a protective insulating film that is arranged in contact with the interlayer insulating film and has a refractive index different from that of the interlayer insulating film; recesses arranged in a light-receiving surface of each of the plurality of photoelectric conversion regions; and embedded regions embedded in the recesses, wherein, when a wavelength of incident light to each of the plurality of photoelectric conversion regions is denoted by λ and a refractive index of the embedded regions is denoted by n, a depth d of the recesses is represented by an expression d≧λ/4n, and wherein the plurality of photoelectric conversion regions includes a semiconductor region for collecting signal carriers, wherein a contact hole is provided above the semiconductor region for collecting signal carriers, and a metal electrode is filled in the contact hole, the semiconductor region for collecting signal carriers is electrically connected to a readout circuit through the metal electrode, and the semiconductor region for collecting signal carriers is not provided with recesses.