Trench structure having a void and inductor including the trench structure

摘要

In a method of forming a trench structure having a wide void therein, a first trench having a first width and a first depth is formed in a substrate. The first trench is filled with a first insulation layer pattern defining the void in the first trench. A second trench is formed on the first trench. The second trench has a second width wider than the first width and a second depth shallower than the first depth. The second trench is filled with a second insulation layer pattern. After an insulating interlayer on the substrate including the first and second trenches, a conductive line is formed on a portion of the insulating interlayer where the second trench is positioned so that an inductor is formed over the trench structure.