Patent ID: 7160811
Filing Date: 2007-01-09
Classification: H01L

Abstract:
1. A method for fabricating a microelectronic product to prevent overetching a substrate with anhydrous HF etchant comprising: providing a substrate comprising topographic features; forming over the topographic features an undoped silicate glass layer; forming upon the undoped silicate glass layer a doped silicate glass layer formed employing a deposition method to form a non-planar topography; etching from the undoped silicate glass layer the doped silicate glass layer to selectively remove the doped silicate glass layer while employing an anhydrous HF etchant; etching the undoped silicate glass layer while employing an aqueous hydrofluoric acid etchant to completely remove the undoped silicate glass layer following said selective removal of the doped silicate glass layer; and, forming a metal silicide on said substrate following said complete removal of said undoped silicate glass layer.