Patent ID: 6214674
Filing Date: 2001-04-10
Classification: H01L

Abstract:
A method of fabricating a high-voltage device suitable for a low-voltage device, comprising:providing a semiconductor substrate of a first type impurity, in which a high-voltage device region and a low-voltage device region are defined;forming a first well of a second type impurity in the high-voltage device region;forming a plurality of second wells of the first type impurity within the first well and forming a third well of the first type impurity in the low-voltage device region wherein the second wells serve as a drift region of the high-voltage region;performing a field implantation of the second type impurity to form a plurality of fourth wells of the second type impurity within the second wells;forming a plurality of field oxide layers above the fourth wells in the high-voltage device region and above the semiconductor substrate in the low-voltage device region;forming a first gate between the field oxide layers above the first well and forming a second gate between the field oxide layers above the third well; andforming a first source/drain region of the first type impurity between the field oxide layers within the second wells and forming a second source/drain region of the second type impurity beside the second gate within the third well.