Patent ID: 7612395

Claim:
A CMOS image sensor comprising: a semiconductor substrate; a photodiode on the semiconductor substrate; an insulating film on the semiconductor substrate, over the photodiode; a microlens that is wider than the photodiode, comprising: i) a first dielectric film on the insulating film and over the photodiode, the first dielectric film having a first refractive index; ii) a second dielectric directly film on the first dielectric film, the second dielectric film having a second refractive index lower than the first refractive index; and iii) a sidewall dielectric film directly on at sidewalls of each of the first and second dielectric films and on the insulating film, the sidewall dielectric film having a curved outer surface and a refractive index equal to the first refractive index; and a fourth dielectric film on the insulating film and on the microlens.