Patent ID: 6858501

Claim:
A method for manufacturing a semiconductor device, comprising: defining a substrate; forming a dielectric layer over the substrate; depositing a first layer of polysilicon over the dielectric layer; providing a layer of nitride over the first layer of polysilicon; etching the layer of nitride and the first layer of polysilicon to form a plurality of composite structures, each having a section of the first polysilicon layer and nitride layer; depositing a layer of oxide using high-density plasma deposition over and between the plurality of composite structures; removing the nitride layer; forming a plurality of spacers over the first polysilicon layer; etching the first polysilicon layer with the plurality of spacers acting as masks; removing the plurality of spacers; forming an inter-gate dielectric layer over the etched first polysilicon layer; and forming a second polysilicon layer over the inter-gate dielectric layer.