Patent ID: 9679935
Date: 2017-06-13
CPC Classifications: H01L

Claim:
1. An image sensor, comprising: a substrate including a top surface and a bottom surface, and having a first conductivity type; a device isolation structure defining a plurality of pixel regions in the substrate; and a photoelectric conversion element formed in each of the pixel regions, and having a second conductivity type different from the first conductivity type, wherein the device isolation structure comprises: an insulating gapfill layer extending from an upper portion to a lower portion of the device isolation structure; a spacer provided at the upper portion of the device isolation structure and interposed between the insulating gapfill layer and the substrate; a lower impurity region provided at the lower portion of the device isolation structure and interposed between the insulating gapfill layer and the substrate, the lower impurity region having the first conductivity type; and an upper impurity region provided between the spacer and the insulating gapfill layer, the upper impurity region having the first conductivity type, wherein the lower impurity region has an impurity concentration higher than that of the upper impurity region.