Patent ID: 11888062
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method of forming a structure for an extended-drain metal-oxide-semiconductor device, the method comprising:
forming a first well in a semiconductor substrate, wherein the semiconductor substrate comprises a first semiconductor material;
forming a second well in the semiconductor substrate, wherein the second well adjoins the first well along an interface;
forming a semiconductor layer positioned on the semiconductor substrate, wherein the semiconductor layer comprises a second semiconductor material that differs in composition from the first semiconductor material;
forming a source region and a drain region in the semiconductor substrate, wherein the source region is positioned in the first well, and the drain region is positioned in the second well;
forming a gate electrode positioned in a lateral direction between the source region and the drain region, wherein the gate electrode includes a first section positioned on a first portion of the semiconductor layer and a second section positioned over the semiconductor substrate; and
forming a gate dielectric including a first portion in direct contact with the first portion of the semiconductor layer and a second portion in direct contact with the semiconductor substrate, the first portion of the gate dielectric positioned in a vertical direction between the first section of the gate electrode and the first portion of the semiconductor layer, and the second portion of the gate dielectric positioned in the vertical direction between the second section of the gate electrode and the semiconductor substrate,
wherein the first portion of the semiconductor layer and the first section of the gate electrode are positioned over a portion of the first well and over a portion of the second well.