Patent ID: 8921937
Filing Date: 2014-12-30
Classification: H01L

Abstract:
1. A high voltage metal-oxide-semiconductor (HV MOS) transistor device, comprising: a substrate, having a first conductive type, and the substrate having at least one electric field concentration region; a deep well, disposed in the substrate, and the deep well having a second conductive type different from the first conductive type; a first doped region, disposed in the deep well, wherein a doping concentration of the first doped region and a doping concentration of the deep well in the electric field concentration region has a first ratio, the doping concentration of the first doped region and the doping concentration of the deep well outside the electric field concentration region has a second ratio, and the first ratio is greater than the second ratio; a high voltage well, disposed in the deep well, and the high voltage well having the first conductive type; a second doped region, disposed in the deep well, and the second doped region having the second conductive type, wherein the first doped region is located between the second doped region and the high voltage well; a third doped region, disposed in the high voltage well, and the third doped region having the second conductive type, wherein the electric field concentration surrounds a part of the third doped region; a gate structure, disposed on the high voltage well between the first doped region and the third doped region; and a fourth doped region, disposed in the high voltage well, and the fourth doped region having the first conductive type.