Patent ID: 6828631
Filing Date: 2004-12-07
Classification: H01L

Abstract:
A high voltage field-effect transistor (HVFET) comprising:a substrate of a first conductivity type; an epitaxial layer of a second conductivity type disposed on the substrate; a diffusion region of the first conductivity type disposed in the epitaxial layer, a junction being formed between the diffusion region and a region of the epitaxial layer; a drain region of the second conductivity type disposed in the epitaxial layer and separated from the junction by a portion of the epitaxial layer; a source region of the second conductivity type disposed in the diffusion region, the source region being spaced-apart from the junction, a channel region being formed between the source region and the junction; an insulated gate disposed above the channel region; a buried region of the first conductivity type disposed within the epitaxial layer and spaced-apart from the drain region, a top channel region being defined in the epitaxial layer above the buried region, the top channel region having a thickness of at least 0.5 microns.