Funneled light pipe for pixel sensors

摘要

A photo sensing structure and methods for forming the same. The structure includes (a) a semiconductor substrate and (b) a photo collection region on the semiconductor substrate. The structure also includes a funneled light pipe on top of the photo collection region. The funneled light pipe includes (i) a bottom cylindrical portion on top of the photo collection region of the photo collection region, and (ii) a funneled portion which has a tapered shape and is on top and in direct physical contact with the bottom cylindrical portion. The structure further includes a color filter region on top of the funneled light pipe.