Patent ID: 6297123
Filing Date: 2001-10-02
Classification: H01L

Abstract:
A method of preventing neck-oxidation phenomena in a storage node of a capacitor element of a dynamic random access memory (DRAM) cell, a node contact of the storage node disposed on a semiconductor wafer, the semiconductor wafer comprising a silicon substrate, a silicon oxide layer above the surface of the silicon substrate, and a node contact in the silicon oxide layer, the node contact connected to the storage node, the method comprising:performing a surface process on the silicon oxide layer, the surface process utilizing an ion implantation process; andforming a silicon nitride layer on the surfaces of the silicon oxide layer and the storage node;wherein the surface process will decrease both the difference in the incubation time and the difference in the thickness between the silicon nitride layer formed above the silicon oxide layer surface and the storage node surface, and prevents the neck-oxidation phenomenon at the interface of the storage node and the node contact.