Patent ID: 7851314
Filing Date: 2010-12-14
Classification: H01L

Abstract:
1. A method for making a short channel LMOS (Lateral MOSFET) with interpenetrating drain-body protrusions (IDBP), the method comprises: a) providing a partially fabricated semiconductor wafer oriented in a horizontal plane with: b) within the upper part of the lower device bulk layer, creating an upper body region of second conductivity type having: c) forming the gate structure atop the revealed top body surface area and the drain-gate field oxide region with a first edge of the gate structure atop the drain-gate field oxide region and a second edge of the gate structure atop the revealed top body surface area and further spaced from the first end of the LMOS channel length by a pre-determined reference distance; d) creating a drain contact zone of first conductivity type at the drain contact location and creating an upper source region of first conductivity type atop the revealed top body surface area with a first end of the upper source region undercutting the second edge of the gate structure by a pre-determined undercut distance such that the first end of the upper source region defines a second end of the LMOS channel length with: e) forming device passivation layers atop the wafer, patterning the device passivation layers for external electrical contacts then forming contact electrodes onto the drain contact zone, the source contact zone and at the body contact location.