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A method for controlling parasitic deposits in a deposition system for depositing a film on a substrate, the deposition system defining a reaction chamber for receiving the substrate and including a process gas in the reaction chamber and an interior surface contiguous with the reaction chamber, inc

A method for controlling parasitic deposits in a deposition system for depositing a film on a substrate, the deposition system defining a reaction chamber for receiving the substrate and including a process gas in the reaction chamber and an interior surface contiguous with the reaction chamber, includes flowing a buffer gas between the interior surface and at least a portion of the process gas to form a gas barrier layer such that the gas barrier layer inhibits contact between the interior surface and components of the process gas.

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That which is claimed is: 1. A method for controlling parasitic deposits in a deposition system for depositing a film on a substrate, the deposition system defining a reaction chamber for receiving the substrate and including a process gas in the reaction chamber and an interior surface contiguous

That which is claimed is: 1. A method for controlling parasitic deposits in a deposition system for depositing a film on a substrate, the deposition system defining a reaction chamber for receiving the substrate and including a process gas in the reaction chamber and an interior surface contiguous with the reaction chamber, the method comprising: providing a buffer gas to the reaction chamber at a temperature greater than a temperature of the process gas in the reaction chamber; and flowing the buffer gas to form a flowing gas barrier layer between the interior surface and at least a portion of the process gas, such that the flowing gas barrier layer inhibits contact between the interior surface and components of the process gas. 2. The method of claim 1 wherein the step of flowing the buffer gas includes flowing the buffer gas along and in contact with the interior surface. 3. The method of claim 1 including flowing the process gas through the reaction chamber in a flow direction, and wherein the step of flowing the buffer gas includes flowing the buffer gas through the reaction chamber in the flow direction. 4. The method of claim 3 wherein the step of flowing the buffer gas includes flowing the buffer gas through the reaction chamber at substantially the same velocity as the process gas. 5. The method of claim 3 including introducing both the buffer gas and the process gas into the reaction chamber at substantially the same location along the flow direction so as to inhibit turbulence in and mixing between their respective flows. 6. The method of claim 1 including flowing the process gas into the reaction chamber through a process gas inlet, and wherein: the process gas inlet has a smaller cross-sectional area than a cross-sectional area of the reaction chamber so as to define a buffer gas region in the reaction chamber; and the step of flowing the buffer gas includes flowing the buffer gas into the buffer gas region. 7. The method of claim 1 wherein the step of flowing the buffer gas includes providing a substantially laminar flow of the buffer gas along the interior surface. 8. The method of claim 1 wherein the interior surface overlies the substrate. 9. The method of claim 1 including heating the buffer gas before introducing the buffer gas into the reaction chamber. 10. The method of claim 1 including heating the buffer gas as the buffer gas flows along the interior surface. 11. The method of claim 1 including heating the interior surface to a temperature sufficient to promote sublimation of parasitic deposits from the process gas that deposit on the interior surface. 12. The method of claim 1 including inductively heating a susceptor member adjacent the interior surface to thereby heat the interior surface. 13. The method of claim 1 wherein the step of flowing the buffer gas includes flowing the buffer gas through the reaction chamber at a velocity of at least about 1 m/s. 14. The method of claim 13 wherein the step of flowing the buffer gas includes flowing the buffer gas through the reaction chamber at a velocity of between about 5 and 100 m/s. 15. The method of claim 1 wherein the buffer gas comprises a noble gas. 16. The method of claim 15 wherein the noble gas is selected from the group consisting of argon, helium, neon, krypton, radon, and xenon. 17. The method of claim 1 wherein the buffer gas comprises H2, N2, NH3 and/or air. 18. The method of claim 1 wherein the buffer gas includes an active material capable of chemically inhibiting the deposition of parasitic deposits on the interior surface and/or removing parasitic deposits from the interior surface. 19. The method of claim 18 wherein the active material includes an etchant. 20. The method of claim 19 wherein the etchant includes at least one of HCl, Cl2 and a carbon-containing gas. 21. The method of claim 1 wherein the deposition system is a chemical vapor deposition (CVD) system. 22. The method of claim 21 wherein the deposition system is a hotwall CVD system. 23. The method of claim 1 wherein the substrate is a semiconductor substrate. 24. The method of claim 23 wherein the substrate comprises a material selected from the group consisting of SiC, sapphire, a Group III nitride, silicon, germanium, and III-V and II-VI compounds and interalloys. 25. The method of claim 1 wherein the process gas comprises a reagent selected from the group consisting of SiH4, C3 H8, C2H4, Si2H6, SiCl 4, SiH2Cl2, SiCl3(CH3), NH 3, trimethyl gallium, and trimethyl aluminum. 26. The method of claim 1 wherein the process gas is adapted to deposit onto the substrate a layer of material selected from the group consisting of SiC, a Group III nitride, silicon, germanium, and III-V and II-VI compounds and interalloys. 27. The method of claim 1 wherein the average temperature of the buffer gas is at least 10째 C. hotter than the average temperature of the process gas in the reaction chamber. 28. A method for controlling parasitic deposits in a deposition system for depositing a film on a substrate, the deposition system defining a reaction chamber for receiving the substrate and including a process gas in the reaction chamber and an interior surface contiguous with the reaction chamber, the method comprising: flowing the process gas through the reaction chamber in a flow directions wherein the flow direction is substantially horizontal; and flowing a buffer gas through the reaction chamber in the flow direction to form a flowing gas barrier layer between the interior surface and at least a portion of the process gas, such that the flowing gas barrier layer inhibits contact between the interior surface and components of the process gas; wherein the step of flowing the buffer gas includes flowing the buffer gas through the reaction chamber at substantially the same velocity as the process gas; and wherein the step of flowing the buffer gas includes providing a substantially laminar flow of the buffer gas along the interior surface to at least a location downstream of the substrate. 29. The method of claim 28 including introducing both the buffer gas and the process gas into the reaction chamber at substantially the same location along the flow direction so as to inhibit turbulence in and mixing between their respective flows. 30. The method of claim 28 including flowing the process gas into the reaction chamber through a process gas inlet, and wherein: the process gas inlet has a smaller cross-sectional area than a cross-sectional area of the reaction chamber so as to define a buffer gas region in the reaction chamber; and the step of flowing the buffer gas includes flowing the buffer gas into the buffer gas region. 31. The method of claim 28 wherein the substrate is a wafer having an exposed surface, the method including positioning the wafer in the reaction chamber such that the exposed surface is disposed horizontally and parallel to the flow direction. 32. A method for controlling parasitic deposits in a deposition system for depositing a film on a substrate, the deposition system defining a reaction chamber for receiving the substrate and including a process gas in the reaction chamber and an interior surface contiguous with the reaction chamber, the method comprising: flowing a buffer gas to form a flowing gas barrier layer between the interior surface and at least a portion of the process gas, such that the flowing gas barrier layer inhibits contact between the interior surface and components of the process gas; and heating the interior surface to a temperature sufficient to promote sublimation of parasitic deposits from the process gas that deposit on the interior surface. 33. The method of claim 32 including flowing the process gas through the reaction chamber in a flow direction, and wherein the step of flowing the buffer gas includes flowing the buffer gas through the reaction chamber in the flow direction. 34. The method of claim 32 including chemically inhibiting the deposition of parasitic deposits on the interior surface and/or removing parasitic deposits from the interior surface using an active material included in the buffer gas. 35. The method of claim 34 wherein the active material includes an etchant. 36. The method of claim 35 wherein the etchant includes at least one of HCl, Cl2 and a carbon-containing gas. 37. The method of claim 32 wherein the substrate is a semiconductor wafer. 38. The method of claim 37 wherein the wafer comprises a material selected from the group consisting of SiC, sapphire, a Group III nitride, silicon, germanium, and III-V and II-VI compounds and interalloys. 39. The method of claim 32 wherein the process gas comprises a reagent selected from the group consisting of SiH4, C3 H8, C2H4, Si2H6, SiCl 4, SiH2Cl2, SiCl3(CH3), NH 3, trimethyl gallium, and trimethyl aluminum. 40. The method of claim 32 wherein the process gas is adapted to deposit onto the wafer a layer of material selected from the group consisting of SiC, a Group III nitride, silicon, germanium, and III-V and II-VI compounds and interalloys.