Patent ID: 9142578
Filing Date: 2015-09-22
Classification: G02B,H01L

Abstract:
1. A semiconductor integrated circuit device comprising: (a) a semiconductor substrate having a first main surface; (b) a photodiode array region provided on the side of the first main surface of the semiconductor substrate; (c) a number of pixel regions provided in matrix form in the photodiode array region; (d) an interlayer insulating film provided over the first main surface of the semiconductor substrate including the photodiode array region; and (e) a multilayer wiring provided in the interlayer insulating film, wherein each of the pixel regions comprises: (c1) a photodiode provided in a surface region of the first main surface of the semiconductor substrate; (c2) a waveguide holding hole provided in the interlayer insulating film above the photodiode and having a substantially perpendicular sidewall; (c3) a silicon oxide-based sidewall insulating film covering the side surface of the waveguide holding hole and reaching the bottom surface thereof; (c4) a first silicon nitride-based insulating film covering the surface of the silicon oxide-based sidewall insulating film and the bottom surface of the waveguide holding hole; (c5) a second silicon nitride-based insulating film covering, in the waveguide holding hole, the surface of the first silicon nitride-based insulating film and having a refractive index higher than that of the first silicon nitride-based insulating film; and (c6) a third silicon nitride-based insulating film provided over the second silicon nitride-based insulating film so as to be embedded in the waveguide holding hole and having a refractive index higher than that of the second silicon nitride-based insulating film.