Patent ID: 9159753
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. An image sensor pixel in an image sensor having a silicon substrate and an interconnect stack formed on a surface of the silicon substrate, wherein the interconnect stack comprises a plurality of oxide layers, the image sensor pixel comprising: a photodiode formed in the surface of the silicon substrate; a transfer gate formed on the surface of the silicon substrate, wherein the transfer gate is configured to transfer charge from the photodiode to a floating diffusion; a blooming control structure, wherein the blooming control structure is configured to remove overflow charge from the photodiode and wherein the blooming control structure is separate from the transfer gate; and a conductive contact material in the interconnect stack that provides a bias voltage to the blooming control structure, wherein the conductive contact material is in contact with the surface of the silicon substrate and is at least partially surrounded by spacer structures that align the conductive contact material with the blooming control structure.