Patent ID: 7564090
Filing Date: 2009-07-21
Classification: H01L

Abstract:
1. A transistor of a semiconductor device, comprising: a stack type gate comprising a tunnel oxide film, a floating gate having two sides with sidewalls, a dielectric film, and a control gate sequentially stacked on a semiconductor substrate; a gate oxide film formed on the semiconductor substrate below the floating gate with respect to the tunnel oxide film, wherein the gate oxide film is formed along the boundary of a portion of a bottom and a side of the floating gate; a first spacer formed to cover both sidewalls of the floating gate, the dielectric film, and the control gate; and floating nitride films buried at gaps between the gate oxide film formed on the semiconductor substrate and the gate oxide film formed along a boundary of a portion of a bottom and a side of the floating gate, wherein the floating nitride films serve as a trap center of a hot charge and store 1 bit charge, and wherein respective first sides at both sides of the floating gate contact the first spacer, respective second sides at both sides of the floating gate contact the gate oxide film, a width between the respective second sides is narrower than a width between the respective first sides, the bottom defines a plane that contacts the tunnel oxide film, and a face between the bottom and the second sides is inclined at a given tilt and contacts the gate oxide film.