Method of manufacturing compound semiconductor wafer

Fishing – trapping – and vermin destroying

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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.

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