Patent ID: 8319284
Filing Date: 2012-11-27
Classification: H01L

Abstract:
1. A laterally diffused metal-oxide-semiconductor device, comprising: a substrate, having an upper surface and a bottom surface; a gate dielectric layer, disposed on the upper surface of the substrate; a gate polysilicon layer, disposed on the gate dielectric layer; a source region and a drain region, both having a first conductivity type, the source region and the drain region being disposed in the substrate and respectively located at two opposite sides of the gate polysilicon layer, wherein a part of the gate dielectric layer is disposed right above the drain region; a body region, having a second conductivity type, the body region surrounding the source region and extending to the substrate under the gate polysilicon layer; a first drain contact plug, disposed in the substrate and located at a side of the drain region opposite to the source region, and the first drain contact plug being in contact with the drain region; a source polysilicon layer, disposed on the part of the gate dielectric layer right above the drain region, and the source polysilicon layer being electrically connected to the source region; an insulating layer, disposed on the substrate and covering the gate polysilicon layer, the source polysilicon layer, and the gate dielectric layer, and the source polysilicon layer being disposed between the insulating layer and the part of the gate dielectric layer; and a source metal layer, disposed on the insulating layer, and the source metal layer electrically connecting the source polysilicon layer and the source region.