Patent ID: 9553123
Date: 2017-01-24
CPC Classifications: H01L

Claim:
1. A back-illuminated sensor chip, comprising one or more pixel areas each comprising a plurality of first pixels and a plurality of second pixels located in a plane and arranged in a matrix, wherein each of the one or more pixel areas further comprises: a central portion consisting of the plurality of first pixels located in vicinity of a center of the pixel area; and a peripheral portion surrounding the central portion and consisting of the plurality of second pixels in the pixel area, wherein: the plurality of first pixels in the central portion have a first height in a vertical direction perpendicular to the plane; the plurality of second pixels in the peripheral portion have a second height in the vertical direction; and the second height is greater than the first height so that the peripheral portion protrudes outward beyond the central portion, wherein: the central portion further comprises: a first portion, centrally situated in the central portion; a second portion, surrounding the first portion and protruding outward beyond the first portion; wherein the peripheral portion has a first ion concentration; the second portion has a third ion concentration; the first portion has a fourth ion concentration; the first ion concentration is higher than the third ion concentration; and the third ion concentration is higher than the fourth ion concentration.