Patent ID: 6093601
Filing Date: 2000-07-25
Classification: H01L

Abstract:
A method of fabricating a crown capacitor, comprising:(a) providing a semiconductor substrate with preformed electrical devices;(b) forming a dielectric layer and a silicon nitride layer overlying said substrate;(c) etching said silicon nitride layer and said dielectric layer to open a contact connecting to said electrical devices;(d) depositing a first polysilicon layer to fill said contact and cover the surface of said silicon nitride layer;(e) sequentially depositing an oxide layer and an oxynitride layer overlying said first polysilicon layer;(f) defining a photoresist pattern on said oxynitride layer for making the bottom electrode of said crown capacitor, and etching said oxynitride layer and said oxide layer;(g) laterally etching said oxide layer;(h) depositing a second polysilicon layer around the surface of said semiconductor substrate;(i) anisotropically etching said second polysilicon layer and said first polysilicon layer by using said oxynitride layer as a mask to form said bottom electrode;(j) removing said oxynitride layer, said oxide layer and a portion of silicon nitride layer; and(k) forming a capacitor dielectric layer overlying said bottom electrode and a top electrode overlying said capacitor dielectric layer.