Patent ID: 11888051
Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method comprising:
forming a first semiconductor layer and a second semiconductor layer adjoining the first semiconductor layer along an interface, wherein the first semiconductor layer comprises a first compound semiconductor material, and the second semiconductor layer comprises a second compound semiconductor material different in composition from the first compound semiconductor material;
forming a first trench located in the first semiconductor layer and the second semiconductor layer;
forming a second trench located in the first semiconductor layer and the second semiconductor layer, wherein the second trench is adjacent to the first trench;
forming a gate window in the first semiconductor layer, wherein the gate window connects the first trench to the second trench;
forming a source/drain region of a high-electron-mobility transistor;
forming a first insulator region of the high-electron-mobility transistor in the first semiconductor layer and the second semiconductor layer, wherein the first insulator region is laterally positioned between an end of the first trench and the source/drain region;
forming a second insulator region of the high-electron-mobility transistor in the first semiconductor layer and the second semiconductor layer, wherein the second insulator region is laterally positioned between an end of the second trench and the source/drain region; and
forming a gate electrode of the high-electron-mobility transistor, wherein the gate electrode is located in the first trench, the second trench, and the gate window,
wherein the high-electron-mobility transistor includes a substrate having an upper surface that faces upwards in a first direction perpendicular to the upper surface, the first insulator region and the second insulator region each extend through the interface, a portion of the first insulator region extends below a lowest extent of a first bottom-most surface of the first trench in the first direction, and a portion of the second insulator region extends below a lowest extent of a second bottom-most surface of the second trench in the first direction.