Patent ID: 8247299
Filing Date: 2012-08-21
Classification: H01L

Abstract:
1. A method of fabricating a flash memory device, the method comprising: forming a tunnel insulating film, a first conductive layer for a floating gate, and a hard mask layer over a semiconductor substrate; patterning the hard mask layer, the first conductive layer for the floating gate, the tunnel insulating film, and the semiconductor substrate to form a trench in the semiconductor substrate; forming an isolation layer so that the trench is gap-filled; removing the patterned hard mask layer after forming the isolation layer; forming a dielectric layer directly on a surface of the patterned first conductive layer for the floating gate and the isolation layer, wherein the dielectric layer is formed of a high dielectric constant (high-k) material; and forming a second conductive layer for a control gate on the dielectric layer; wherein a top surface of the isolation layer after the formation of the second conductive layer is higher than that of the floating gate, wherein the high-k material is formed using any one of Al