Patent ID: 6204141
Filing Date: 2001-03-20
Classification: H01L

Abstract:
A method of manufacturing a deep trench capacitor, comprising:forming a first silicon oxide layer on a substrate;forming a first trench in the substrate;forming a rugged polysilicon layer on a surface of the first trench, wherein the grains of the rugged polysilcon layer distributed discretely on surface of the first trench;forming a second silicon oxide layer on the rugged polysilicon layer;etching the exposed substrate in the first trench, in order to form a plurality of second trenches in the substrate of the first trench;removing the first and second silicon oxide layer;forming a first conductive layer over the substrate, wherein the first conductive layer is conformal to the first trench and the second trenches;forming a dielectric layer on the first conductive layer; andforming a second conductive layer on the dielectric layer.