Patent ID: 8049289

Claim:
An image sensor comprising: a semiconductor substrate including a plurality of unit pixels; an interlayer dielectric layer and a metal interconnection on the semiconductor substrate, wherein the interlayer dielectric layer comprises a plurality of dielectric layers, each dielectric layer comprising a lowermost etch stop layer, at least one conformal or gap-fill dielectric layer, at least one bulk dielectric layer, and at least one cap layer; first, second and third color filters on or over the semiconductor substrate, the first color filter having a first color, the second color filter having a second color different from the first, and the third color filter having a third color different from the first and the second colors; first micro-lenses in physical contact with the first and third color filters, each of the first micro-lenses comprising (i) a lower portion having a square shape and an outer periphery with substantially vertical sidewalls and (ii) an upper portion having a convex shape; and second micro-lenses on the second color filters.