Patent ID: 6228739
Filing Date: 2001-05-08
Classification: H01L

Abstract:
A pre-treatment method performed on a semiconductor structure before growing hemi-spherical grains (HSGs) thereon, the pre-treatment method comprising:(a) dry-etching a material layer formed on a surface of a semiconductor substrate, the material layer having a photoresist pattern formed thereon, and wherein the dry-etching forms the semiconductor structure comprising a storage node pattern on the semiconductor substrate;(b) performing multiple ashing sequences on the semiconductor structure using an etching gas;(c) stripping the semiconductor structure with H.sub.2 SO.sub.4 to remove any residue remaining on the semiconductor structure after the multiple ashing sequences;(d) cleaning the semiconductor structure with an ammonium peroxide mixture (APM); and(e) growing the HSGs on storage nodes of the storage node pattern.