Patent ID: 8501567
Filing Date: 2013-08-06
Classification: H01L

Abstract:
1. A manufacturing method of a high voltage device, comprising: providing a first conductive type substrate for forming the high voltage device and a low voltage device in the substrate, wherein the substrate has an upper surface; forming a second conductive type buried layer in the substrate beneath the upper surface; forming a first conductive type high voltage well between the upper surface and the buried layer from cross-section view, wherein the first conductive type high voltage well is formed by a first step in a process for forming the low voltage device, the first step being for forming a first conductive type well of the low voltage device, and the first conductive type high voltage well has a lower concentration than the first conductive type well of the low voltage device by partially blocking an area of the first conductive type high voltage well in an implantation process; and forming a second conductive type body beneath the upper surface by a second step in the process for forming the low voltage device, the second step being for forming a second conductive type well of the low voltage device, wherein the second conductive type body is adjacent to the high voltage well and located at a different horizontal position from the high voltage well.