Patent ID: 6262459
Filing Date: 2001-07-17
Classification: H01L

Abstract:
A high-voltage device constructed on a substrate, the high-voltage device comprising:a first well region with a first conductive type located in the substrate;a second well region with the second conductive type located in the substrate and isolated from the first well region;a plurality of field oxide layers located on a surface of the second well region;a shallow trench isolation located between the field oxide layers in the second well region;a first doped region with the second conductive type located beneath the field oxide layers;a second doped region with the first conductive type located beneath the shallow trench isolation in the second well region;a third well region with the first conductive type located in the first well region, wherein the third well region expands from a surface of the first well region into the first well region;a gate structure positioned on the substrate between the first and the second well regions, wherein the gate structure covers a portion of the first, the third well regions and the field oxide layers;a source region with the second conductive type located in the third well region exposed by the gate structure; anda drain region with the second conductive type located in the second well region exposed by the gate structure and the field oxide layers.