Patent ID: 11862676
Assignee: CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor device, comprising:
a drift region with a first conductivity type;
a body region with a second conductivity type, formed in the drift region;
a first doped region and a second doped region, respectively formed in the body region, wherein
the first doped region has the first conductivity type, the second doped region has the second conductivity type;

a first trench gate and an extension region, wherein
the first trench gate is formed by filling a first trench, the first trench penetrates the first doped region, the body region and extends to the drift region;
the extension region has the second conductivity type and is formed in the drift region located under the first trench, and surrounds the bottom wall of the first trench;
the first trench is filled with a first conductive structure at the bottom and a second conductive structure at the top, the first conductive structure and the second conductive structure are isolated from each other;
a dielectric layer is formed between the second conductive structure and the inner wall of the first trench, as well as between the first conductive structure and the inner wall of the first trench not surrounded by the extension region;

a second trench gate, formed by filling a second trench, wherein
the second trench penetrates the first doped region and the body region, the second trench is filled with a third conductive structure and the dielectric layer between the third conductive structure and the inner wall of the second trench;

a gate, electrically connected to the second conductive structure and the third conductive structure;
a first electrode, electrically connected to the first doped region and the second doped region;
a second electrode lead-out region, in contact with the drift region; and
a second electrode, electrically connected to the second electrode lead-out region.