Patent ID: 9685552
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A silicon carbide field effect transistor, comprising: a silicon carbide substrate; an n-type drift layer, disposed on the silicon carbide substrate; a p-type epitaxy layer, disposed on the n-type drift layer; a source region, formed at the p-type epitaxy layer and away from the n-type drift layer; a trench gate, penetrating through the p-type epitaxy layer and extending to the n-type drift layer; at least one p-type doped region, formed at the n-type drift layer and adjacent to a lateral side of the trench gate; a source, covering the source region and the trench gate; a dielectric layer, disposed between the trench gate and the source; and a drain, disposed at the silicon carbide substrate and away from the n-type drift layer; wherein, the p-type doped region comprises a first doped block being in contact with the first p-type epitaxy layer, and a plurality of second doped blocks disposed below the first doped block and arranged along a direction from the first doped block to the silicon carbide substrate, and wherein between each two of the second doped blocks, which are adjacent, is a second distance and the thickness of each second doped block does not exceed 2 um.