Patent ID: 8748261
Filing Date: 2014-06-10
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a first-conductivity-type semiconductor layer; a base region of a second-conductivity-type formed in an upper portion of the first-conductivity-type semiconductor layer; first though third trenches penetrating through the base region and reaching to the first-conductivity-type semiconductor layer, the first through third trenches being linked to one another; a source interconnect layer buried in the first through third trenches, the source interconnect layer comprising a protruding portion protruding from an upper end of the second trench; a gate electrode buried in the first trench and the third trench, and formed over the source interconnect layer; a source metal contacting the protruding portion of the source interconnect layer; and a gate metal contacting the gate electrode in the third trench, wherein a contact face between the source metal and the protruding portion at the second trench is higher than a contact face between the gate metal and the gate electrode at the third trench.