Patent ID: 8052794

Claim:
A method for forming uniformly-doped epitaxial layers on a substrate, the method comprising: positioning a substrate on a top surface of a satellite in a reactor for epitaxial deposition, the satellite being positioned such that at least a first drive gas channel through which a drive gas travels is defined between the bottom surface of the satellite and a top surface of a platter; positioning the bottom surface of the satellite on the top surface of the platter having at least a second drive gas channel through which a drive gas travels, the second drive gas channel being in communication with the top surface of the platter and a bottom surface of the platter; directing a first gas flow containing a reactant gas and a doping gas across a top surface of the substrate; directing a drive gas and a second reactant gas through the second drive gas channel; directing the drive gas and the second reactant gas through the first drive gas channel; and rotating the platter and the satellite to introduce the second reactant gas from the second drive gas channel to the first drive gas channel and to the edge of the rotating substrate.