Patent ID: 6355182
Filing Date: 2002-03-12
Classification: H01L

Abstract:
A process for forming a capacitor storage cell on a semiconductor substrate comprising the steps of:forming a first layer of an oxide on the surface of said substrate; forming a second layer of an oxide on said first layer of oxide; forming an opening into said first and second oxide layers; forming a polysilicon or amorphous silicon container structure having generally vertically-oriented side walls in said opening; exposing said second oxide layer to a liquid comprising a halide-containing species; exposing said second oxide layer to a gas phase comprising a halide-containing species, thereby exposing the side walls of said container structure; without exposing said substrate to oxygen or an oxygen-containing gas, annealing said container walls at an elevated temperature to transform said polysilicon into hemispherical grain silicon; conductively doping said hemispherical grain silicon walls to form capacitor plates; forming a capacitor dielectric layer over said capacitor plates; and forming a second conductive silicon layer over said capacitor dielectric layer.