Patent ID: 6329268
Filing Date: 2001-12-11
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device having an amorphous-silicon film, said method comprising the steps of:(1) cleaning a wafer so as to remove microparticles and metallic impurities from a surface of said amorphous-silicon film;(2) immersing said wafer in dilute hydrofluoric acid solution to remove from said surface of said amorphous-silicon film a chemical oxide film that was formed thereon by said cleaning;(3) rinsing said wafer in pure water;(4) drying said wafer using isopropyl alcohol to remove water from said surface of said amorphous-silicon film, said drying comprising vaporizing said isopropyl alcohol and directly replacing a residual water content on a surface of said amorphous-silicon film with said isopropyl alcohol; and(5) forming large, substantially uniform hemispherical grains onto said surface of said amorphous-silicon film,wherein said steps are performed in sequence indicated by the step numbers and said steps 2-4 are performed in an inert gas environment.