Patent ID: 6201278
Filing Date: 2001-03-13
Classification: H01L

Abstract:
An IGFET, comprising:a semiconductor substrate including a trench;a gate insulator on a bottom surface of the trench;a non-floating gate electrode on the gate insulator, wherein the gate electrode has a planar top surface and a majority of a thickness of the gate electrode is in the trench;insulative spacers between the gate electrode and opposing sidewalls of the trench, wherein the insulative spacers have planar top surfaces that are coplanar with the planar top surface of the non-floating gate electrode;insulative segments on the substrate, wherein the insulative segments are adjacent to the insulative spacers and the insulative segments have planar top surfaces that are coplanar with the planar top surfaces of the insulative spacers and with the planar top surface of the non-floating gate electrode; anda source and a drain in the substrate and adjacent to the bottom surface.