Fishing – trapping – and vermin destroying
Patent
1994-03-25
1995-06-20
Breneman, R. Bruce
Fishing, trapping, and vermin destroying
437107, 437126, 437133, 437174, 117 84, H01L 21203
Patent
active
054260680
ABSTRACT:
An undoped p-type GaAs epitaxial layer or an n-type GaAs epitaxial layer is grown on the surface of a wafer, and thereafter the wafer is annealed at a temperature which ranges from 800.degree. C. to 1,200.degree. C. and is equal to or higher than a predetermined critical temperature depending on the carrier concentration in the epitaxial layer before it is annealed. The epitaxial layer thus annealed is rendered semi-insulating without addition of any impurity. Accordingly, performances of an electronic device which incorporates such a wafer are improved.
REFERENCES:
patent: 5137847 (1992-08-01), Shimakura et al.
Imaizumi Toyoaki
Oda Osamu
Breneman R. Bruce
Japan Energy Corporation
Paladugu Ramamohan Rao
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