Patent ID: 6051852
Filing Date: 2000-04-18
Classification: H01L

Abstract:
An antiblooming structure for image sensing device comprising:a semiconductor substrate of a first conductivity type, having an antiblooming channel implant of a second conductivity type opposite the first conductivity type contained on a major surface of the substrate;a buried channel implanted from the second conductivity type within a portion of the antiblooming channel such that it is adjacent to, and self aligned with each of a pair of opposite outer edges of an antiblooming barrier region that is formed in areas where the antiblooming channel implant that has not been implanted by the buried channel implant;a drain formed within the antiblooming barrier region such that it is self aligned with each of a pair of opposite inner edges of the antiblooming barrier region;at least one gate electrode over the structure; andwherein the image sensing device is a charge coupled device (CCD) having a plurality of cells, each of the cells having a plurality of phases separated by barrier regions of the second conductivity type that create a direction of charge transfer, the CCD barrier regions being formed perpendicular to the antiblooming regions adjacent the CCD and parallel the direction of charge transfer such that the combined dopants of the antiblooming barrier regions and CCD barrier regions create a series of isolation regions in all but one phase of the CCD.