Patent ID: 9105656
Filing Date: 2015-08-11
Classification: H01L

Abstract:
1. A manufacturing method of a high voltage device, comprising: forming isolation regions for defining a device region in a first conductive type substrate; forming a gate on the first conductive type substrate; forming a source and a drain in the device region, at both sides of the gate respectively, wherein the source and the drain are doped with second conductive type impurities; forming a second conductive type well in the first conductive type substrate, which surrounds the drain from top view; forming at least a first deep trench isolation structure, which is formed in the first conductive type substrate, and is located in the second conductive type well between the source and the drain from top view, wherein the first deep trench isolation structure has a depth deeper than the second conductive type well from cross-section view; and forming a first surrounding region within the second conductive type well, which is doped with first conductive type impurities, and completely surrounds the first deep trench isolation structure from top view, the first surrounding region being shallower than the second conductive type well from cross-section view.