Patent ID: 6593594
Filing Date: 2003-07-15
Classification: H01L

Abstract:
A power lateral metal-oxide-semiconductor silicon carbide field effect transistor (LMOSFET) comprising:a first silicon carbide semiconductor layer having a p-type conductivity; n-type source and drain regions implanted in the first silicon carbide semiconductor layer; an insulated gate electrode formed on the first silicon carbide semiconductor layer, the insulated gate electrode defining a channel region therebeneath in the first silicon carbide semiconductor layer; source and drain electrical contacts formed on the first silicon carbide semiconductor layer, and a gate electrical contact formed on the insulated gate electrode; a silicon carbide semiconductor substrate having an n-type conductivity, the silicon carbide semiconductor substrate supporting the first silicon carbide semiconductor layer; a second silicon carbide semiconductor layer having a p-type conductivity, the second silicon carbide semiconductor layer being heavily doped and disposed between the silicon carbide semiconductor substrate and the first silicon carbide semiconductor layer for preventing parasitic transistor effects; and a sinker region having an n-type conductivity implanted in the first and second silicon carbide semiconductor layers, the sinker region extending from the source electrical contact to the silicon carbide semiconductor substrate thereby grounding the silicon carbide semiconductor substrate, wherein the silicon carbide semiconductor substrate has a sheet resistance of about or less than 0.02 ohm/sq.