Silicon carbide metal-semiconductor field effect transistors and methods of fabricating silicon carbide metal-semiconductor field effect transistors

摘要

A metal-semiconductor ficld-cffcct transistor is disclosed comprising: a silicon carbide substrate (10); an n-type epitaxial layer (14) of n-type conductivity silicon carbide on the substrate; ohmic contacts (20,22) on the n-type epitaxial layer that respectively define a source and a drain; a cap layer of n-type silicon carbide on the n-type epitaxial layer, the cap layer (15) including a first recess therein and a second recess in the n-type epitaxial layer within the first recess in the cap layer; and a Schottky metal contact (40) on the n-type epitaxial layer that is between the ohmic contacts, and thereby between the source and the drain, to form an active channel in the n-type epitaxial layer between the source and the drain when a bias is applied to the Schottky metal contact, the Schottky metal contact being within the recess in the n-type epitaxial layer. Also disclosed is a corresponding method.