Patent ID: 8624296

Claim:
A high electron mobility transistor (HEMT) comprising: a first III-V compound layer; a second III-V compound layer disposed on the first III-V compound layer and different from the first III-V compound layer in composition, the second III-V compound layer having a top surface; a source feature and a drain feature disposed on the second III-V compound layer; a gate electrode disposed over the second III-V compound layer between the source feature and the drain feature; a protection layer covering the source feature and the drain feature; a fluorine region embedded in the second III-V compound layer under the gate electrode, wherein the fluorine region has a top surface lower than the top surface of the second III-V compound layer; and a gate dielectric layer disposed under at least a portion of the gate electrode and over the fluorine region, wherein a portion of the gate dielectric layer is on the protection layer.