Patent ID: 8300128

Claim:
A solid-state image pickup device comprising: a semiconductor substrate having a light-incident surface; a plurality of pixels arranged on the light-incident surface; a photodiode arranged in each of the pixels; an insulating film arranged on the semiconductor substrate and configured to cover the photodiodes; wirings containing copper embedded in the insulating film, each of the wirings being covered with a coating configured to prevent diffusion of the copper, each of the coatings including (a) a barrier metal layer configured to cover a lower surface and side surfaces of each of the wirings and (b) a diffusion preventing film configured to cover an upper surface of each of the wirings; a film which makes etching stop, said film which makes etching stop being distant from a lowermost wiring among the wirings; a trench arranged above each of the photodiodes so as to reach the film which makes etching stop, said trench disposed so as not to pass entirely through the film which makes etching stop; and a structure with which each of the trenches is filled, the structure having a higher refractive index than the insulating film.