Patent ID: 9685519
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a substrate, and a field region disposed in the substrate and defining active regions of the substrate, and wherein the substrate has active trenches therein extending in and across the active regions, and the field region has field trenches therein, and gate trenches are each constituted by respective ones of the active trenches and respective ones of the field trenches together; and word lines each occupying the gate trenches, respectively, and each of the word lines extending longitudinally in a first direction across a plurality of the active regions and the field region, and wherein each of the word lines includes active gate electrodes disposed within the active trenches constituting a respective one of the gate trenches, and field gate electrodes in line with the active gate electrodes in the first direction and disposed within the field trenches constituting said respective one of the gate trenches, and each of the field gate electrodes is disposed between respective ones of the active regions that are adjacent to each other, in a second direction that crosses the first direction, with one word line therebetween, and each of the field gate electrodes has a bottommost surface disposed at a level higher than that of bottommost surfaces of the active gate electrodes.