Patent ID: 6232175
Filing Date: 2001-05-15
Classification: H01L

Abstract:
A method for forming a double-recess crown-shaped capacitor of a dynamic random access memory (DRAM), comprising the steps of:providing a substrate;forming a first dielectric layer and a conductive plug;forming a first conductive layer over the first dielectric layer;forming a second dielectric layer over the first conductive layer;patterning the second dielectric layer to form a patterned third dielectric layer;forming an organic bottom anti-reflective coating (organic BARC) over the patterned third dielectric layer and the first conductive layer;removing the organic BARC above the patterned third dielectric layer and a portion of the patterned third dielectric layer to form a patterned fourth dielectric layer within the patterned third dielectric layer and a first trench in the first conductive layer;removing the organic BARC;etching to form a second trench under the first trench and a third trench in the first conductive layer using the patterned fourth dielectric layer as an etching mask, wherein the second trench exposes a portion of the first dielectric layer while the third trench is not deep enough to expose the first dielectric layer;removing the patterned fourth dielectric layer such that the first conductive layer having the second trench and the third trench thereon forms a double-recess lower electrode;forming a fifth dielectric layer over the exposed surface of the double-recess lower electrode; andforming a second conductive layer over the fifth dielectric layer.