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Methods and apparatuses for separately injecting gases into a reactor for a substrate processing system. The flow profiles of the gases are controlled with two or more sets of adjustable gas flow injectors. The methods are particularly useful for selective deposition of gases in a CVD system using v

Methods and apparatuses for separately injecting gases into a reactor for a substrate processing system. The flow profiles of the gases are controlled with two or more sets of adjustable gas flow injectors. The methods are particularly useful for selective deposition of gases in a CVD system using volatile combinations of precursors and etchants. In either case, the gases are provided along separate flow paths that intersect in a relatively open reaction space, rather than in more confined upstream locations.

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1. A reactor for processing substrates, comprising: a substantially rectangular, horizontal flow reaction chamber comprising a first side and an opposite second side;a substrate support configured for supporting a substrate with a major surface exposed, the substrate support positioned inside the re

1. A reactor for processing substrates, comprising: a substantially rectangular, horizontal flow reaction chamber comprising a first side and an opposite second side;a substrate support configured for supporting a substrate with a major surface exposed, the substrate support positioned inside the reaction chamber between the first side and the second side of the reaction chamber;a first set of adjustable gas injectors configured to inject a first gas from a first reactant source into a mixing space and control a gas flow profile of the first gas into the mixing space;a second set of adjustable gas injectors configured to inject a second gas from a second reactant source into the mixing space and control a gas flow profile of the second gas into the mixing space, wherein the first set of adjustable gas injectors includes no common gas injectors with the second set of adjustable gas injectors, and wherein the first and second sets of adjustable gas injectors are disposed on a common wall extending along a portion of the mixing space and are positioned on the first side of the reaction chamber;wherein the reactor is configured so that the first and second gases first mix together at the mixing space to form a gas mixture and form a substantially unidirectional common flow path of the gas mixture from the mixing space to the substrate support, the common flow path having no flow restrictions between the mixing space and the substrate support; andan outlet configured to allow flow from the reaction chamber, wherein the outlet is positioned on the second side of the reaction chamber. 2. The reactor of claim 1, wherein the first and second gases comprise a precursor for vapor deposition and a vapor etchant, respectively. 3. The reactor of claim 2, wherein the precursor comprises trisilane (Si3H8) and the etchant comprises diatomic chlorine (Cl2). 4. The reactor of claim 2, wherein the precursor comprises a silane and the etchant comprises hydrogen chloride (HCl). 5. The reactor of claim 1, further comprising an injector housing at least partially containing the first and second sets of injectors. 6. The reactor of claim 1, further comprising: a first injector housing at least partially containing the first set of injectors; anda second injector housing at least partially containing the second set of injectors. 7. The reactor of claim 5, wherein the first and second sets of injectors can be accessed from a common direction relative to the housing. 8. The reactor of claim 5, wherein the first and second sets of injectors can be accessed from different directions relative to the housing, said different directions separated by at least 30 degrees. 9. The reactor of claim 5, wherein the first and second sets of injectors can be accessed from generally opposing directions relative to the housing. 10. The reactor of claim 1, wherein the substrate support is configured to support a substrate of a particular diameter, the mixing space having a width perpendicular to a direction of the common flow path, said width being greater than or equal to the diameter of the substrate. 11. The reactor of claim 1, wherein the first and second sets of adjustable gas injectors are configured so that the first and second gases mix within a reaction space defined by the reaction chamber. 12. The reactor of claim 1, wherein each of the first and second sets of injectors is configured to inject a plurality of gas jets, each injector of each injector set configured to control a flow rate of one of the gas jets, relative to flow rates of others of the gas jets. 13. A reactor for processing substrates, comprising: a horizontally elongated, horizontal flow reaction chamber defining a reaction space, the reaction chamber comprising a first end and a second end opposite the first end;a substrate support configured for supporting a substrate with a major surface exposed inside the reaction chamber, the substrate support positioned between the first end and the second end;a first set of adjustable gas injectors configured to inject the first gas from a first reactant source into the reaction space and control a gas flow profile of the first gas into the reaction space;a second set of adjustable gas injectors configured to inject the second gas from a second reactant source into the reaction space and control a gas flow profile of the second gas into the reaction space, wherein the first set of adjustable gas injectors includes no common gas injectors with the second set of adjustable gas injectors, and wherein the first set of adjustable gas injectors and the second set of adjustable gas injectors are disposed on a common wall extending along a portion of the reaction space and are positioned at the first end of the reaction chamber, wherein each of the first and the second set of adjustable gas injectors comprise three or more substantially collinear adjustable gas injectors; andan outlet configured to allow flow from the reaction chamber, wherein the outlet is positioned at the second end of the reaction space, such that the first and second sets of adjustable gas injectors and the outlet define a flow path for the first gas and the second gas across the substrate support, the flow path being predominantly horizontal and parallel to the exposed major surface of the substrate;wherein the first and second gases initially mix within the reaction space. 14. The reactor of claim 13, wherein the first and second gases comprise a precursor for vapor deposition and a vapor etchant, respectively. 15. The reactor of claim 14, wherein the precursor comprises trisilane (Si3H8) and the etchant comprises diatomic chlorine (Cl2). 16. The reactor of claim 14, wherein the precursor comprises a silane and the etchant comprises hydrogen chloride (HCl). 17. The reactor of claim 13, further comprising an injector housing at least partially containing the first and second sets of injectors. 18. The reactor of claim 13, further comprising: a first injector housing at least partially containing the first set of injectors; anda second injector housing at least partially containing the second set of injectors. 19. The reactor of claim 17, wherein the first and second sets of injectors can be accessed from a common direction relative to the housing. 20. The reactor of claim 17, wherein the first and second sets of injectors can be accessed from different directions relative to the housing, said different directions separated by at least 30 degrees. 21. The reactor of claim 17, wherein the first and second sets of injectors can be accessed from generally opposing directions relative to the housing. 22. The reactor of claim 13, further comprising a mixing space within the reaction space, wherein the first and second gases mix at the mixing space and form the flow path from the mixing space to the substrate support, wherein the flow path has no restrictions between the mixing space and the substrate support. 23. The reactor of claim 13, wherein the substrate support is configured to support a substrate of a particular diameter, the mixing space having a width perpendicular to a direction of gas flow of the first and second gases, said width being greater than or equal to the diameter of the substrate. 24. An apparatus for selectively forming a semiconductor film on a substrate, the apparatus comprising: a horizontal flow chemical vapor deposition (CVD) reactor comprising a reaction space and an outlet configured to allow flow from the reaction space;a substrate support configured for supporting a substrate with a major surface exposed, the substrate support positioned within the reaction space between a first side of the reaction space and an opposite second side of the reaction space;a first inlet set of two or more inlets in fluid communication with the reaction space;a second inlet set of two or more inlets in fluid communication with the reaction space;a first reactant source configured to supply a precursor for semiconductor deposition to the first inlet set; anda second reactant source configured to supply an etchant to the second inlet set,wherein the inlet sets and sources define separate flow paths for the precursor and the etchant to a mixing space within the reaction space, the apparatus configured such that the precursor and etchant initially mix together within the mixing space, wherein the first and second inlet sets are disposed on a common wall extending along a portion of the mixing space and are positioned on the first side of the reaction space, each of the inlets opening directly into the mixing space, wherein the inlets are commonly aligned with respect to each other to direct the precursor and the etchant in a common direction from the common wall into the mixing space;wherein the outlet is positioned on the second side of the reaction space such that the first and second inlet sets and the outlet define a flow path for the precursor and etchant across the substrate support, the flow path being predominantly horizontal and parallel to the exposed major surface of the substrate. 25. The apparatus of claim 1, wherein the first set of adjustable gas injectors controls the gas flow profile of the first gas across a width of the mixing space, and the second set of adjustable gas injectors controls the gas flow profile of the second gas across the width of the mixing space, the width of the mixing space being greater than or equal to a diameter of a substrate that the substrate support is designed to support. 26. The apparatus of claim 13, wherein the first set of adjustable gas injectors controls the gas flow profile of the first gas across a width of the reaction space, and the second set of adjustable gas injectors controls the gas flow profile of the second gas across the width of the reaction space. 27. The apparatus of claim 1, wherein the injectors of the first set of adjustable gas injectors are configured to emit gas jets oriented substantially in parallel with each other, and the injectors of the second set of adjustable gas injectors are configured to emit gas jets oriented substantially in parallel with each other. 28. The apparatus of claim 13, wherein the injectors of the first set of adjustable gas injectors are configured to emit gas jets oriented substantially in parallel with each other, and the injectors of the second set of adjustable gas injectors are configured to emit gas jets oriented substantially in parallel with each other. 29. The apparatus of claim 13, wherein the first and second sets of adjustable gas injectors are configured to inject at least one gas curtain into and across a width of the reaction space.