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Semiconductor device with low thermally generated leakage current

  • US 5,382,814 A
  • Filed: 08/12/1993
  • Issued: 01/17/1995
  • Est. Priority Date: 01/08/1991
  • Status: Expired due to Term
First Claim
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1. A semiconductor device having first, second and third semiconducting region connected in series for current input, current control and current output respectively and each arranged to be biased by a respective biasing means, wherein the device includes an extracting contact comprising a means for extracting minority carriers from the second region and the second region is of low doping and has a common interface with a fourth semiconducting region, said fourth semiconducting region having a common interface with a fifth semiconducting region, and wherein the fourth region:

  • (a) has like majority carrier type to that of the fifth region,(b) is biasable through the fifth region and comprises an excluding contact means for excluding minority carriers from at least parts of the second region adjacent the third region and thereby to reduce the intrinsic contribution to current reaching the third region,(c) has a bandgap sufficiently large to provide a potential energy barrier to minority carrier flow from the fifth region to the second region,(d) has sufficiently high doping to counteract potential barrier impediment to majority carrier flow from the second region to the fifth region, and(e) is less wide than a critical thickness associated with dislocation formation but sufficiently wide to inhibit tunnelling of minority carriers from the fifth region to the second region.

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