Patent ID: 6368951
Filing Date: 2002-04-09
Classification: H01L

Abstract:
A semiconductor device manufacturing method comprising:a step of forming a trench to a first insulation film formed on a semiconductor substrate, and forming a lower level wiring in said trench; a step of forming at least one conductive layer on said semiconductor substrate to cover said lower level wiring; a step of forming at least one thin film layer on said conductive layer; a step of forming a hard mask by patterning said thin film; a step of etching said conductive layer by using said hard mask as an etching mask, and forming a conductive pillar-shaped structure, whose upper surface is covered with said hard mask, on said lower level wiring; a step of forming a second insulation film on said semiconductor substrate so that said pillar-shaped structure is buried; a step of forming a wiring trench in which at least said hard mask is exposed; and a step of burying a conductor into said wiring trench after said hard mask is removed, and forming an upper level wiring in said wiring trench.