Patent ID: 6063671
Filing Date: 2000-05-16
Classification: H01L

Abstract:
A method of forming a high-voltage device, comprising the steps of:providing a substrate with a first electrical type;forming a first doped region with a second electrical type in the substrate;forming a first field oxide layer located on the first doped region and a second field oxide layer on the substrate near the first doped region;forming a second doped region with the second electrical type within the substrate between the first field oxide layer and the second field oxide layer;forming a third doped region with the first electrical type on the substrate on the other side of the second field oxide layer and opposite the second doped region;forming a drain region within the second doped region and a source region within the third doped region nearby the second field oxide layer, wherein the drain region and the source region have the second electrical type;forming a fourth doped region within the first doped region within the third doped region nearby the source region;removing the second field oxide layer;forming a gate oxide layer on the substrate, wherein the gate oxide layer and the first field oxide layer completely cover the substrate;forming openings to expose a part of the source region and to expose a part of the drain region; andforming a gate electrode, a source electrode connecting to the source region and a drain electrode connecting to the drain region.