Patent ID: 8736012

Claim:
A trenched semiconductor structure, comprising: a semiconductor substrate doped with impurities of a first conductive type having a first impurity concentration; an epitaxial layer doped with impurities of the first conductive type of a second impurity concentration, formed on the semiconductor substrate; a plurality of active region trenches, formed in the epitaxial layer; at least a termination region trench, formed in the epitaxial layer and away from the active region trenches; an ion implantation layer, formed in a bottom of the active region trenches by doping impurities of a second conductive type; a termination region dielectric layer, covering the termination region trench; an active region dielectric layer, covering the ion implantation region in the active region trenches; and a first polysilicon layer, covering the active region dielectric layer and filling the active region trenches; wherein, the first impurity concentration is greater than the second impurity concentration, and a depth of the termination region trench is greater than that of the active region trenches and close to a depth of a depletion region under reverse breakdown.