Patent ID: 8152923

Claim:
A reactor for gas treatment of one or more substrates, the reactor comprising: a source of a first reactant gas; a source of a second reactant gas reactive with the first reactant gas; a reaction chamber; a substrate holder for supporting the one or more substrates mounted within the reaction chamber for rotation about an axis extending in upstream and downstream directions; an injector head disposed upstream of the substrate holder, the injector head including structure defining: a plurality of first gas inlets coupled to the source of the first reactant gas, the first gas inlets being disposed only in a first row extending in a first radial direction perpendicular to the axis and in a second row extending in a second radial direction perpendicular to the axis and perpendicular to the first radial direction; and a plurality of second gas field inlets coupled to the source of the second reactant gas, the second gas field inlets being disposed in quadrants of the injector head around the axis between the rows of first gas inlets.