Patent ID: 6097054
Filing Date: 2000-08-01
Classification: H01L

Abstract:
A semiconductor memory device comprising:a semiconductor substrate;one or more memory-cell regions including a plurality of storage nodes being formed on said semiconductor substrate, each of said storage nodes having an HSG (hemispherical grained) silicon film pretreated with an HSG preprocess using dilute fluoric acid as an etching liquid; andone or more accessory pattern regions disposed outside said memory-cell regions on said semiconductor substrate, said accessory pattern regions including a plurality of first accessory patterns and one or more second accessory patterns disposed corresponding to said plurality of first accessory patterns, each of said first accessory patterns comprising a groove pattern in a condition in which contact holes for formation of said storage nodes have been formed in said memory cell regions, and said second accessory patterns formed of said HSG silicon film deposited so as to cover at least all parts of a sidewall surface of each of said first accessory patterns, and thereby so as not to expose any part of said sidewall surface of each of said first accessory patterns to said etching liquid when said HSG silicon film is filled in each of said contact holes and is shaped into said storage nodes.