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Apparatus and process for growing silicon epitaxial layer

  • US 5,993,555 A
  • Filed: 01/16/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 01/16/1997
  • Status: Expired due to Fees
First Claim
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1. An apparatus for growing a silicon epitaxial layer on a main surface of a silicon substrate wafer, said apparatus having a horizontal chamber containing a susceptor mounted within the chamber for holding the silicon substrate wafer in a horizontal position on a top surface of the susceptor so that the main surface of the silicon substrate wafer is facing upward, said apparatus comprising:

  • a series of injectors arranged transversely to a horizontal axis of the chamber, the injectors comprising a central injector passing a flow of a reactive gas past a central part of the chamber and peripheral injectors passing flows of the reactive gas past a peripheral part of the chamber, the reactive gas consisting of a silicon source, a dopant and hydrogen;

    a gas feeder system connected to the central injector and the peripheral injectors and feeding the reactive gas to the injectors;

    an auxiliary dopant feeder system connected to the central injector and passing flows of dopant gas past the central part of the chamber, wherein both the gas feeder system and the auxiliary dopant feeder system are connected to the central injector through a central flow line; and

    means connected between the auxiliary dopant feeder system and the central injector for absorbing pressure variations in the central flow line to prevent the pressure variations from reaching the auxiliary dopant feeder system.

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