Patent ID: 7838956
Filing Date: 2010-11-23
Classification: H01L

Abstract:
1. A back-illuminated image sensor, comprising: a sensor layer having a frontside and a backside opposite the frontside; an insulating layer adjacent the backside; a circuit layer adjacent the frontside; a plurality of photodetectors of a first type conductivity for converting light incident on the backside into photo-generated charges, the photodetectors having a depletion region, wherein the plurality of photodetectors are disposed in the sensor layer adjacent the frontside; a region of a second type conductivity formed in at least a portion of the sensor layer adjacent the frontside and connected to a voltage terminal for biasing the second type conductivity region at a predetermined voltage; a well of the second type conductivity formed in the sensor layer adjacent the backside; and trench isolations in the sensor layer starting at the frontside and extending beyond the depletion region of the photodetectors and to portions of the insulating laver, wherein the trench isolations include portions that do not extend to the insulating layer so as to connect the well at the backside between adjacent photodetectors; and a lining of the second type conductivity lining the trench isolations, wherein the lining electrically connects the region of the second type conductivity adjacent the frontside with the well adjacent the backside.