Patent ID: 6413830
Filing Date: 2002-07-02
Classification: G11C,H01L

Abstract:
A method of forming a capacitor on a semiconductor support wafer comprising the steps of:forming a diffusion area in the support wafer to provide a first electrode and a second electrode of the capacitor; implanting a first gas in the diffusion area to form a dielectric layer at a predetermined depth, wherein a first region of the diffusion area is formed below the dielectric layer as the first electrode of the capacitor and a second region of the diffusion area is formed above the dielectric layer as the second electrode of the capacitor; etching a trench in the support wafer to isolate laterally the dielectric layer; growing an epitaxial layer; and implanting a second gas to isolate said epitaxial layer from the second electrode, wherein the capacitor is formed substantially subjacent a semiconductor device formed in the epitaxial layer.