Patent ID: 6613690
Filing Date: 2003-09-02
Classification: H01L

Abstract:
A method of forming a buried stack capacitor structure on a semiconductor substrate, comprising the steps of:forming a silicon oxide filled, shallow trench isolation (STI) region, in a top portion of said semiconductor substrate; forming recesses in said STI region, in which said recesses are separated; depositing a bottom electrode layer; depositing a dielectric layer; forming photoresist plugs on said dielectric layer, in regions in which said dielectric layer resides in said recesses in said STI region; selectively removing portions of said dielectric layer not protected by said photoresist plugs, exposing portions of said bottom electrode layer; selectively removing exposed portions of said bottom electrode layer not covered by said photoresist plugs, resulting in n storage node structures, comprised of said bottom electrode layer, located in said recesses in said STI region; forming a capacitor dielectric layer on said storage node structure; and forming top electrode plate structures resulting in buried stack capacitor structures.