Patent ID: 6794245
Filing Date: 2004-09-21
Classification: H01L

Abstract:
A method comprising: forming a container electrode including:forming a bottom electrode layer by using a hemispherical silicon grain (HSG) polysilicon over interior surfaces and smooth polysilicon over exterior surface of a container formed in a substrate; forming a barrier layer over the HSG polysilicon layer; removing any HSG polysilicon and barrier layers formed over the substrate and around the container opening to expose an upper surface of the substrate; removing the substrate comprising silicon oxide material to expose a portion of outside surface of the formed smooth polysilicon layer; after removing the substrate comprising silicon oxide material removing the barrier layer to expose interior surfaces of the HSG polysilicon layer; and forming a silicon nitride layer over the HSG polysilicon layer after removing the barrier layer to expose interior surfaces of the HSG polysilicon layer, the silicon nitride layer formed in contact with the HSG polysilicon layer.