Patent ID: 9583618
Date: 2017-02-28
CPC Classifications: H01L

Claim:
1. A metal-oxide-semiconductor field effect transistor (MOSFET) comprising: a substrate; a gate structure over a top surface of the substrate, wherein the gate structure has a gate dielectric layer over the top surface of the substrate; a source in the substrate on a first side of the gate structure, wherein a first dopant concentration is between the source and a region under the gate dielectric layer, and a depth of the first dopant concentration is shallower than a depth of the source; a drain in the substrate on a second side of the gate structure opposite the first side, wherein a second dopant concentration is between the drain and the region under the gate dielectric layer, and the second dopant concentration is less than the first dopant concentration; and a deep well in the substrate extending under the source, the gate structure and the drain.