Patent ID: 7378313
Filing Date: 2008-05-27
Classification: H01L

Abstract:
1. A method of forming a semiconductor device, comprising: forming a dual-sided bottom electrode layer by using a smooth polysilicon over interior surfaces of a container formed in a substrate; removing any smooth polysilicon layer formed over the substrate and around the container opening to expose the upper surface of the substrate; removing the substrate to expose a portion of outside surface of the formed smooth polysilicon layer to form the dual-sided smooth polysilicon container; depositing a nitride layer over the interior and exposed outer surfaces of the smooth polysilicon layer; depositing a barrier layer over the nitride layer such that the barrier layer fills the container; removing the barrier layer and the nitride layer to form a recess and to further expose a top potion of formed smooth polysilicon of the container; removing the remaining barrier layer to expose the remaining nitride layer; oxidizing the exposed smooth polysilicon to form an oxide cap on the top portion of the container; removing the remaining nitride layer to expose the smooth polysilicon surfaces of the container; and forming a HSG polysilicon layer over the interior surfaces of the smooth polysilicon layer within the container.