Patent ID: 6967073

Claim:
A method of fabricating an image sensor, comprising: forming a bottom antireflection coating over an exposed surface of an active image sensing device structure; forming a color filter array on the bottom antireflection coating; and substantially removing exposed portions of the bottom antireflection coating; wherein the active image sensing device structure comprises an array of light sensing elements, forming the color filter array comprises forming an array of color filters each disposed over a respective light sensing element such that light travels from each color filter to a respective light sensing element through a respective light transmission path substantially transmissive to radiation in a visible wavelength range, forming the bottom antireflection coating comprises forming the bottom antireflection coating with a thickness less than approximately 200 nm, and after the removing, remaining portions of the antireflection coating are disposed in each light transmission path between the color filter array and the active image sensing device structure.