Patent ID: 6586329
Filing Date: 2003-07-01
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising the steps of:forming a first film on a semiconductor substrate, forming on said first film an etching mask having an opening exposing partially a surface of said first film, forming a first hole having a sidewall and a bottom wall of said first film by selectively etching said first film using said etching mask, removing said etching mask, forming a second hole having a sidewall and a bottom wall of a second film and a diameter smaller than that of said first hole by forming on said first film including the sidewall and the bottom wall of said first hole said second film of a material having an under-etching characteristic equivalent to said first film, and forming a third hole having a sidewall matching the sidewall of said second hole by etching anisotropically said first and second films.