Patent ID: 8377206
Filing Date: 2013-02-19
Classification: C30B,H01L

Abstract:
1. An apparatus to form semiconductor devices, comprising: an inner tube having an open first end and an open second end; a boat disposed inside the inner tube to support a plurality of wafers such that the plurality of wafers are vertically stacked; an outer tube disposed to surround the inner tube and having a closed first end and an open second end; a flange provided with a ring-shaped outside base with a first side of the outside base supporting a surface of the second end of the outer tube and a ring-shaped inside base of the flange supporting a surface of the second end of the inner tube; a gas supply member connected to the flange below the inside base to supply gas to the inner tube; a gas exhaust member connected to the flange between the inside base and the outside base to exhaust gas inside the outer tube; and a plate with at least one through-hole to allow the gas to flow therethrough, the plate being disposed at the open first end of the inner tube, and the at least one through-hole including a first through-hole disposed at a central portion of the plate and a plurality of second through-holes disposed at an edge portion of the plate and arranged to surround the first through-hole, wherein the sum of open areas of the through-holes of the plate is 10 to 60 percent of the entire area of the plate.