A DC-to-DC converter includes one or more switching circuits, a respective energy storage inductor electrically coupled to each of the one or more switching circuits, and a controller. The mesh implant comprises at least a first and a second material, wherein the second material is substantially degraded at a later point in time than the first material following the time of implantation. The gate insulation pattern is formed on the gate electrode and is smaller than the gate electrode. The second opening portion has a smaller depth than the first opening portion. Other variations and features consistent with the present invention exist.