Manufacture of silicon on the inside of a tube

Claim 1

Apparatus for producing a selected semiconductor material comprising: a muffle; a tube of a selected semiconductor material within said muffle, said tube having first and second opposite ends; means for supporting said tube within said muffle; means surrounding said muffle for heating said tube; heat insulation means surrounding said muffle for substantially preventing loss of heat from said muffle; a supply of a gaseous semiconductor compound containing said selected semiconductor material; first and second end means for closing off the first and second opposite ends respectively of said tube, said first and second end means being adapted to provide an air-tight connection to the ends of said tube, said first end means including first and second concentric conduits for feeding said semiconductor compound and hydrogen into the first end of said tube, said first conduit communicating directly with the interior of said tube near the center thereof, and said second conduit communicating with the interior of said tube via several discharge ports which are in said first end means and are located so as to discharge gas into the reaction chamber; and means connected to said second end mens for removing any unreacted portion of said semiconductor compound from said tube.