Patent ID: 6362044
Filing Date: 2002-03-26
Classification: H01L

Abstract:
A method of forming on a semiconductor substrate a capacitor electrode comprising polysilicon having a rough surface, said method comprising:removing a spontaneous oxidation film adhering to an amorphous silicon surface of a semiconductor substrate, heating said amorphous silicon to a designated temperature, spraying SiH4 at a designated temperature on said amorphous silicon to form an amorphous silicon/polysilicon mixed-phase active layer on the surface, annealing at a designated temperature to form a HSG so as to roughen said amorphous silicon surface, PH3-annealing the HSG-forming polysilicon at a designated temperature, wherein introduction of PH3 at a designated concentration is started at the start of heating to the designated temperature upon loading a plurality of the HSG-formed substrates into a reactor for PH3 annealing, and nitriding said amorphous silicon surface at a designated temperature by continuously introducing NH3 gas instead of PH3.