Patent ID: 6090458
Filing Date: 2000-07-18
Classification: C23C

Abstract:
A film formation method for depositing a film on a substrate by irradiating said substrate with a laser beam, comprising the steps of:introducing at least two kinds of carrier gases non-reactive to reactions in depositing said film on said substrate, differing from each other in molecular weight:supplying a reactive gas into a reaction chamber, in which a substrate is placed, by using a mixture of said at least two kinds of non-reactive carrier gases;during operation of the method, controlling a composition of said mixture of at least two kinds of non-reactive carrier gases to control an efficiency of supplying the reactive gas; andirradiating said substrate with a laser beam to deposit a film on said substrate, wherein said mixture of carrier gases is formed by blending a first carrier gas with at least one different carrier gas;wherein said controlling step comprises the steps of:increasing a proportion of a carrier gas having a smaller molecular weight in said mixture to reduce an efficiency of supplying the reactive gas; andincreasing a proportion of a carrier gas having a greater molecular weight in said mixture to enhance said efficiency.