Patent ID: 7807222

Claim:
A method for manufacturing a gas divider for a semiconductor processing reactor, comprising: providing a partially-formed gas divider configured to form a wall at least partially defining a process chamber of the reactor; forming holes in the gas divider, the holes extending completely through the gas divider and each hole having an opening on a first side of the gas divider, the opening having a first width, each of the holes comprising: a constriction having a passage having a constriction length and a constriction width transverse to the constriction length, the constriction width in a plane substantially parallel to a plane of the first width, wherein the constriction width is smaller than the first width, wherein a constriction ratio of the constriction length to the constriction width is about 15:1 or less; and a first portion which opens directly to the first side of the gas divider, the first portion having a first length and a first width, the first length extending between the constriction and the opening, wherein a first ratio of the first length to the first width is about 15:1 or less; and coating surfaces of the gas divider, including the surface of the holes, by chemical vapor deposition.