Patent ID: 8836064

Claim:
A method for fabricating a light sensor, comprising: (a) covering a surface of a semiconductor substrate, which includes a photodetector sensor region, with photoresist; (b) performing photolithography using a photomask to define a pattern in the photoresist that includes one or more dummy corners, dummy islands and/or dummy rings in a region that is beyond the photodetector sensor region, but is within a region that will be covered by a dielectric optical coating at a depositing step (d); (c) using a developer, removing a portion of the photoresist that covered the photodetector sensor region and covered a circumferential region surrounding the photodetector sensor region, wherein the portion of the photoresist that is removed and a portion of the photoresist that remains depends on the pattern defined at step (b); (d) depositing a dielectric optical coating over the photodetector sensor region, over the circumferential region, and over the photoresist not covering the photodetector sensor region that remained after the removing at step (c); and (e) lifting off a portion of the dielectric optical coating that is over the remaining photoresist not covering the photodetector sensor region, so that a remaining portion of the dielectric optical coating covers the photodetector sensor region and the circumferential region.