Patent ID: 6794219
Filing Date: 2004-09-21
Classification: H01L

Abstract:
A method for creating a lateral overflow drain, anti-blooming structure in a charge coupled device, the method comprising the steps of:(a) providing a substrate of a first conductivity type; (b) providing a layer of silicon dioxide on the substrate; (c) providing a layer of silicon nitride on the silicon dioxide layer; (d) providing a first masking layer on the silicon nitride layer and having an opening in the first masking layer of a dimension which substantially equals a dimension of a subsequently implanted channel stop of the first conductivity type; (e) etching away the exposed silicon nitride within the opening in the first masking layer; (f) implanting ions of the first conductivity type through the first masking layer and into the substrate for creating the channel stop and removing the first masking layer; (g) growing the silicon dioxide layer so that the channel stop is spanned by a thickest field silicon dioxide layer in the etched away portion; (h) patterning a second masking layer having an opening adjacent the channel stop with a dimension substantially equal to a dimension of a subsequently implanted lateral overflow drain of a second conductivity type; (i) etching away the exposed silicon nitride within the opening in the second masking layer; (j) implanting the second conductivity type for forming the lateral overflow drain and removing any remaining masking layer; and (k) growing the silicon dioxide layer so that a thicker silicon dioxide forms spanning the lateral overflow drain and the thickest silicon dioxide layer forms spanning the channel stop.