Patent ID: 6544869
Filing Date: 2003-04-08
Classification: C23C,C30B,Y10T

Abstract:
A method for depositing a semiconductor film on a wafer by making a source gas supplied flow almost horizontally to the surface of the wafer, the method comprising the steps of:a) controlling the flow velocity and pressure of the source gas to find a first flow velocity and a first pressure that make such a combination as substantially uniformizing the thickness of the film deposited, and then determining a reference flow rate, which meets a predetermined relationship with the product of the first flow velocity and the first pressure, for the source gas; b) changing the first flow velocity and the first pressure into a second flow velocity and a second pressure with the reference flow rate kept constant; and c) supplying the source gas onto the wafer at the reference flow rate with the flow velocity and pressure of the source gas set equal to the second flow velocity and the second pressure, respectively, thereby depositing the film on the wafer.