Patent ID: 8980000
Filing Date: 2015-03-17
Classification: C23C,C30B

Abstract:
1. A method of treating substrates comprising: rotating a substrate support about an axis while supporting one or more substrates on the support so that one or more surfaces of the substrates to be treated lie substantially perpendicular to the axis of rotation in a gas treatment chamber; introducing a plurality of gas streams each with a known cross-sectional stream area into the chamber toward the substrate via a plurality of gas inlets, each said stream containing a reactant gas and at least one carrier gas, at least two different ones of the streams containing different carrier gases with different molecular weights, the plurality of gas streams having different concentrations of the reactant gas at different radial distances from the axis, the flow rates per unit cross-sectional area of the carrier gases in each of said streams being selected so that the total density of the gases constituting each stream is the same as the total density of the gases constituting the other streams and so that the total flow rate of the gases per unit cross-sectional area constituting each stream is the same as the total flow rate per unit cross-sectional area of the gases constituting each other stream.