Patent ID: 6727127
Filing Date: 2004-04-27
Classification: H01L

Abstract:
In the fabrication of a laterally diffused MOS (LDMOS) transistor in a silicon substrate, the process steps of:a) forming a gate structure including a gate oxide, a doped polysilicon body on the gate oxide, and a nitride cap layer on the doped polysilicon body, b) forming a spacer oxide around the gate structure, c) forming a seal oxide by oxidation of exposed silicon of the substrate around the gate structure, and d) removing the nitride cap layer, e) using a photoresist mask to implant dopant for a source region abutting the spacer oxide and for a drain region spaced from the spacer oxide and to remove the seal oxide from over the source region and from over the drain region, and f) forming silicide contacts to the source region, the drain region, and the gate.