Patent ID: 8674440
Filing Date: 2014-03-18
Classification: H01L

Abstract:
1. A semiconductor structure comprising at least one metal-oxide-semiconductor field-effect transistor (MOSFET) power device, the semiconductor structure comprising: a first insulating layer formed on a substrate; an active region formed on at least a portion of the first insulating layer; a buried well having a first conductivity type formed in the active region; a source region having a second conductivity type formed in the active region proximate an upper surface of the active region, the source region being electrically connected to the buried well, a drain region having the second conductivity type formed in the active region proximate the upper surface of the active region and spaced laterally from the source region; a body region having the first conductivity type formed in the active region between the source and drain regions on at least a portion of the buried well, wherein at least a portion of the source region extends laterally into the body region and the drain region comprises a lightly doped drain extension region extending from the body region; a gate formed above the active region proximate the upper surface of the active region and at least partially between the source and drain regions, the gate structure being electrically isolated from the active region by a gate insulating layer; a drain terminal formed on an upper surface of active region and electrically connecting with the drain region; a source terminal electrically connecting with the source region; a gate terminal electrically connecting with the gate; and a shielding structure formed proximate the upper surface of the active region between the gate and the drain region, the shielding structure comprising a field plate configured to control an electric field distribution along a top oxide interface away from an edge of the gate nearest the drain terminal, the buried well being configured, in conjunction with the active region, to form a clamping diode operative to position a breakdown avalanche region between the buried well and the drain terminal, a breakdown voltage of the MOSFET power device being a function of one or more characteristics of the buried well.