Patent ID: 6503806
Filing Date: 2003-01-07
Classification: H01L

Abstract:
A method for preventing oxidation of a metal film during formation of a gate reoxide film following formation of a gate electrode of a semiconductor device, comprising the steps of:stacking a gate oxide film, a doped first silicon film, a diffusion preventing film, a metal film having a high melting point and a mask insulating film on a semiconductor substrate; forming a gate electrode by patterning a resultant stack structure; forming a second silicon film on an entire surface of a resultant structure; forming an oxidation preventing film on an entire surface of a resultant structure; anisotrophically etching the oxidation preventing film and the second silicon film in a single step to form a spacer on a side wall of said gate electrode; and forming a gate reoxide film on the semiconductor substrate by oxidizing the semiconductor substrate, said spacer preventing oxidation of said metal film.