Patent ID: 8058136
Filing Date: 2011-11-15
Classification: H01L

Abstract:
1. A self-alignment method for a recess channel dynamic random access memory, in which said self-alignment method being applied in a manufacturing process of a stack dynamic random access memory, comprising the steps of: providing a substrate, wherein said substrate includes a target layer having a plurality of shallow trench isolation structures, a barrier layer and a lining layer sequentially formed on a surface of said substrate; patternizing said lining layer, said barrier layer and said target layer to form a plurality of recess trench channels penetrated through said lining layer and said barrier layer and extended into said target layer; forming a dielectric layer to cover and fill said recess trench channel; selectively forming an ion doped region onto said target layer; removing a portion of said dielectric layer to expose a portion of said recess trench channel; stacking a plurality of types of filling materials to form a filler layer to cover and fill said recess trench channel; removing a portion of said filler layer to expose a portion of said recess trench channel; forming a passivation layer to cover and fill said recess trench channel; removing said passivation layer formed on a surface of said lining layer; and removing said lining layer, and self-aligning a position corresponding to said recess trench channel to form a plurality of structural monomers disposed on and protruded from said target layer.