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Silicon transistor device with silicon-germanium electron gas hetero structure channel

  • US 5,272,365 A
  • Filed: 05/26/1992
  • Issued: 12/21/1993
  • Est. Priority Date: 03/29/1990
  • Status: Expired due to Term
First Claim
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1. A semiconductor heterostructure transistor, which comprises:

  • a substrate body made from silicon substrate of a first conductivity type having a surface;

    a source and a drain of a second conductivity type which are spaced apart from each other to define a channel region therebetween in said substrate body;

    a gate electrode which is electrically insulated from the channel region and which is at least partially overlying the channel region; and

    a silicon-germanium layer arranged below a silicon surface layer of the substrate body to partially extend into and coincide with said source and to partially extend into and coincide with said drain, said silicon-germanium layer having a lateral spatial extent which is limited to the coinciding regions and which essentially consists of a region between said source and said drain and which has first and second end portions that terminate within a corresponding one of said source and said drain.

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