Methods for fabricating group III nitride compound...

Semiconductor device manufacturing: process – Making field effect device having pair of active regions... – Having insulated gate

Reexamination Certificate

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C438S199000, C438S201000

Reexamination Certificate

active

06861305

ABSTRACT:
The present invention provides a Group III nitride compound semiconductor with suppressed generation of threading dislocations. A GaN layer31is subjected to etching, so as to form an island-like structure having a shape of, for example, dot, strip, or grid, thereby providing a trench/mesa structure, and a mask4is formed at the bottom of the trench such that the upper surface of the mask4is positioned below the top surface of the GaN layer31. A GaN layer32is lateral-epitaxially grown with the top surface31aof the mesa and sidewalls31bof the trench serving as nuclei, to thereby bury the trench, and then epitaxial growth is effected in the vertical direction. In the upper region of the GaN layer32formed above the mask4through lateral epitaxial growth, propagation of threading dislocations contained in the GaN layer is31can be prevented.

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