Patent ID: 9548359
Date: 2017-01-17
CPC Classifications: B82Y,H01L

Claim:
1. A method of manufacturing a semiconductor device, the method comprising: providing a semiconductor structure, which includes a semiconductor substrate and a first mask layer on the substrate; using the first mask layer to form a plurality of first trenches in the semiconductor substrate that extend laterally in a first direction and do not intersect each other, the plurality of first trenches extending into the substrate; filling the plurality of first trenches with a fill material; forming a second mask layer on the semiconductor structure filled with the fill material; and using the second mask layer to form a plurality of second trenches in the semiconductor substrate that extend laterally in a second direction and do not intersect each other, each of the second trenches intersecting at least one of the plurality of first trenches; and removing the fill material to form a plurality of vertical pillars defined by intersecting first trenches and second trenches.