Patent ID: 8860134

Claim:
A trench power device, comprising: a base defining a cell area, a terminal area, and a channel stop area, the terminal area arranged between the cell area and the channel stop area, wherein the base includes a substrate and a semiconductor layer formed on the substrate, and the semiconductor layer comprises: an epitaxial layer disposed on the substrate, the conductivity type of the epitaxial layer identical to the conductivity type of the substrate; a doped body region connected to the epitaxial layer, the doped body region arranged in the cell area and away from the substrate, the conductivity type of the doped body region different from the conductivity type of the epitaxial layer; a S/D region connected to the doped body region, the S/D region arranged in the cell area and away from the substrate; and a doped contact-carrying region having a periphery portion connected to the doped body region and an intermediate portion non-connected to the doped body region, the doped contact-carrying region approximately arranged outside a projecting portion defined by orthogonally projecting from the S/D region to the doped body region; a trench gate structure embedded in the semiconductor layer arranged in the cell area, the trench gate structure passing through the S/D region and the doped body region and extended into the epitaxial layer; a trench source structure embedded in the semiconductor layer arranged in the cell area, the trench source structure arranged apart from the trench gate structure, the trench source structure passing through the doped body region and extended into the epitaxial layer, wherein a top portion of the trench source structure away from the substrate is connected to the intermediate portion of the doped contact-carrying region, the depth of the trench source structure in reference to the epitaxial layer is greater than the depth of the trench gate structure in reference to the epitaxial layer; and a contact at least partially arranged in a space jointly defined by the S/D region and the doped contact-carrying region, the contact connected to the S/D region and the doped contact-carrying region; wherein the electric potential of the S/D region in reference to the contact is identical to the electric potential of the doped body region in reference to the contact via the doped contact-carrying region, and the electric potential of the S/D region in reference to the contact is identical to the electric potential of the trench source structure in reference to the contact via the doped contact-carrying region.