Patent ID: 8430960

Claim:
A deposition system for depositing a film on a substrate, the deposition system comprising: a) a reaction chamber arranged and configured to receive the substrate and the process gas; b) an interior surface contiguous with the reaction chamber; c) a process gas supply system to supply a flow of the process gas to the reaction chamber; d) a buffer gas supply system arranged and configured to supply a flow of a buffer gas between the interior surface and at least a portion of the process gas and flowing in contact with the process gas such that the flow of the buffer gas forms a gas barrier layer to inhibit contact between the interior surface and components of the process gas when the process gas is disposed in the reaction chamber; and e) at least one susceptor member to heat the reaction chamber; wherein the system is arranged and configured to provide the buffer gas to the reaction chamber at a temperature greater than a temperature of the process gas in the reaction chamber.