Patent ID: 6435865
Filing Date: 2002-08-20
Classification: C23C,C30B,H01L

Abstract:
A vertical furnace equipped with self-positioning gas injectors for processing wafers comprising:a cylindrical-shaped tube having a sealed top and an open bottom, said open bottom being sealable by an end cap; a cavity formed inside said cylindrical-shaped tube having a size sufficient for a wafer carrier to be positioned therein; a mounting ring for positioning inside said cavity juxtaposed to said open bottom, said mounting ring having a substantially rectangular cross-section, a width in the radial direction, a thickness in the vertical direction, and a plurality of slot openings each opens to an outer periphery of said ring and each having a different depth cut into said width of said ring; and a plurality of gas injectors each formed in a â€œLâ€  shape having a vertical portion and a horizontal portion in fluid communication with each other, each of said horizontal portions having an inlet end and are provided with a stopper mounted on a bottom surface at a different location when measured from said inlet end of said horizontal portion such that when said plurality of gas injectors are positioned on top of said mounting ring with each of said nozzle stopper engaging a corresponding one of said plurality of slot openings, the horizontal portions of said plurality of gas injectors extend into said cavity of said cylindrical-shaped tube in said radial direction at a substantially equal distance as measured from an inner surface of said cylindrical-shaped tube.