Patent ID: 6486015
Filing Date: 2002-11-26
Classification: H01L

Abstract:
A method of forming a self-aligned feature comprising:providing a multiplicity of gate stack depositions; depositing a spacer nitride against a multiplicity of sides of each of said multiplicity of gate stacks; depositing at a temperature between 500Â° C. and 700Â° C. a layer of silicon oxy nitride containing carbon over all exposed surfaces, wherein said carbon is evenly distributed throughout said silicon oxy nitride; depositing boro phospho silicate glass (BPSG) filling a height above said gate-stack deposition; chemical mechanical polishing said BPSG; depositing oxide and annealing; depositing a mask on said oxide; etching a contact hole in said oxide through a portion of said gate stack to a first depth; etching said contact hole further in said Silicon dioxide through a width of said nitride spacer to a second depth; filling said contact hole with polysilicon;. etching a bitline trench in said oxide; and filling said bitline trench with metal.