Patent ID: 6777749
Filing Date: 2004-08-17
Classification: H01L

Abstract:
A high voltage field-effect transistor (HVFET) comprising:a substrate of a first conductivity type; a first region of a second conductivity type disposed in the substrate; a source region of the second conductivity type disposed in the substrate spaced-apart from the first region, a channel region being formed between the source region and the first region; a drain region of the second conductivity type disposed in the first region; a buried region of the first conductivity type disposed within the first region, a first conduction channel being formed in an upper region above the buried region and a second conduction channel being formed in a lower region below the buried region, the buried region being spaced-apart from the drain region; and an insulated gate formed over the channel region, wherein said upper region is a part of said first region and extends from said buried region to a top edge of said first region; said lower region is a part of said first region and extends from said buried region to a bottom edge of said first region; and, wherein said buried region has a lateral width and a vertical thickness; and said lateral width is substantially greater than said vertical thickness.