Patent ID: 8703522
Filing Date: 2014-04-22
Classification: H01L

Abstract:
1. A method, comprising: forming a semi-conductive layer of a first conductivity type; forming a shallow isolation trench in the semi-conductive layer; forming a pinning layer of a photodiode in the semi-conductive layer, wherein the pinning layer has the first conductivity type; forming a plurality of second doping regions of the photodiode in the semi-conductive layer, wherein the plurality of second doping regions have a second conductivity type and are formed to different depths in the semi-conductive layer; forming one or more first doping regions of the photodiode in the semi-conductive layer, wherein the one or more first doping regions have the first conductivity type and are formed between the plurality of second doping regions; forming a field stop region of the first conductivity type under the shallow isolation trench and contiguous with the pinning layer and the one or more first doping regions; and forming another doping region of the second conductivity type that surrounds the one or more first doping regions and the plurality of second doping regions.