Patent ID: 6037017
Filing Date: 2000-03-14
Classification: C23C,H01L

Abstract:
A method for forming a multilayer film having at least a first film and a second film formed on the first film, comprising steps of:(a) introducing a first Si-containing gas and a first Si-free gas into a reduced-pressure reaction chamber provided with at least a pair of planar electrodes, generating a plasma state therein and depositing the first film on a substrate or a substrate having a film already formed thereon;(b) terminating at least the first Si-containing gas and stopping the deposition the first film; and(c) introducing a second Si-containing gas and a second Si-free gas into the reduced-pressure reaction chamber and depositing the second film on the first film;wherein, during an interval after terminating the first Si containing gas until the second Si containing gas is introduced, at least one preparatory gas for retaining the plasma state which is not capable of depositing the first film or the second film is introduced into the chamber,wherein the plasma state during the interval is controlled during a first stage and a second stage which is consecutive to the first stage, andwherein P.sub.1 <P.sub.2 .ltoreq.P.sub.c and P.sub.1 <P.sub.a, where P.sub.1 is a pressure in the chamber within the first stage, P.sub.2 is a pressure in the chamber during the second stage, P.sub.a is a pressure in the chamber within step (a), and P.sub.c is a pressure in the chamber within step (c).