Patent ID: 9666622
Date: 2017-05-30
CPC Classifications: G02B,H01L

Claim:
1. A semiconductor integrated circuit device including a CMOS image sensor, comprising: a photodiode formed in a semiconductor substrate and configuring a part of the CMOS image sensor; an interlayer insulating film formed over the photodiode; a waveguide holding hole formed in the interlayer insulating film above the photodiode; a first silicon nitride-based insulating film being a sidewall shape and formed over a side surface and an edge of a hole bottom surface of the waveguide holding hole; a second silicon nitride-based insulating film being a sidewall shape and formed along the first silicon nitride-based insulating film; and a third silicon nitride-based insulating film formed along the second silicon nitride-based insulating film and covering the hole bottom surface, wherein the waveguide holding hole is embedded by the first, second and third silicon nitride-based insulating films, wherein the second silicon nitride-based insulating film has a refractive index higher than that of the first silicon nitride-based insulating film, and wherein the third silicon nitride-based insulating film has a refractive index higher than that of the second silicon nitride-based insulating film.