Patent ID: 11916152
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method of forming a semiconductor device, comprising:
providing a silicon-on-insulator (SOI) substrate including a substrate dielectric layer and a first semiconductor sublayer of a semiconductor layer on the substrate dielectric layer, the first semiconductor sublayer including a first semiconductor material having a first conductivity type, the semiconductor layer having a bottom surface located at a boundary between the semiconductor layer and the substrate dielectric layer;
forming a second semiconductor sublayer of the semiconductor layer on the first semiconductor sublayer, the second semiconductor sublayer including a second semiconductor material having the first conductivity type, the second semiconductor sublayer extending to a top surface of the semiconductor layer;
forming a barrier region of a Schottky diode in the semiconductor layer, the barrier region having a second conductivity type, opposite from the first conductivity type;
forming a drift region of the Schottky diode in the semiconductor layer, the drift region contacting the barrier region, the drift region having the second conductivity type;
forming a guard ring of the Schottky diode in the semiconductor layer, the guard ring having the first conductivity type, the guard ring including a first guard ring segment contacting the barrier region on a first lateral side of the barrier region and extending deeper in the semiconductor layer from the top surface than the barrier region, the guard ring including a second guard ring segment contacting the barrier region on a second lateral side of the barrier region and extending deeper in the semiconductor layer from the top surface than the barrier region, the first lateral side and the second lateral side being perpendicular to the bottom surface, the second lateral side being located opposite from the first lateral side; and
forming a metal-containing layer contacting the barrier region.