Patent ID: 7723151

Claim:
A method of fabricating a CMOS image sensor, comprising: forming at least one photodiode in a predetermined surface of a semiconductor substrate; forming a color filter layer over the semiconductor substrate including the at least one photodiode, the color filter layer having at least one color filter arranged corresponding to the at least one photodiode; forming a planarizing layer over the semiconductor substrate including the color filter layer; forming, on the planarizing layer, a first insulating layer to have a microlens pattern according to an arrangement of the at least one color filter; forming, on the planarizing layer, a second insulating layer to have a sidewall pattern disposed along lateral sides of the microlens pattern; and forming at least one microlens by an anisotropic etching of the microlens pattern and the sidewall pattern to have a focusing centerline, a central lens portion, and a peripheral lens portion, wherein the focusing centerline passes through the central lens portion and wherein the peripheral lens portion surrounds the central lens portion, wherein the peripheral lens portion has a convex structure smaller than a convex structure of the central lens portion, wherein the central lens portion has a first convex curvature and the peripheral lens portion has a second convex curvature, wherein the first convex curvature has a first radius, the second convex curvature has a second radius, and the first radius is greater than the second radius.