Patent ID: 9437643
Filing Date: 2016-09-06
CPC Classification: G02B,H01L

Claim Text:
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 formed over a side surface and a bottom surface of the waveguide holding hole; a second silicon nitride-based insulating film formed over the first silicon nitride-based insulating film; and a third silicon nitride-based insulating film formed over the second silicon nitride-based insulating film, 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.