Patent ID: 6351007
Filing Date: 2002-02-26
Classification: B82Y,H01L

Abstract:
A semiconductor device having a source region, a drain region, a channel region located between the source region and the drain region, a gate region for controlling a channel current flowing through the channel region, a floating gate region located between the channel region and the gate region, a first insulating film located between the floating gate region and the gate region and a second insulating film located between the channel region and the floating gate region,the floating gate region being comprised of a quantum thin line formed by the steps of: forming a stepped portion on a semiconductor substrate; forming a nitride film on an upper portion and a lower portion of the semiconductor substrate by which the stepped portion is formed; masking a region of the nitride film which covers the lower portion of the semiconductor substrate and etching back the nitride film, consequently exposing the upper portion of the semiconductor substrate; forming a first oxide film by oxidizing the exposed upper portion of the semiconductor substrate and forming a linear protruding portion on the semiconductor substrate along a side surface of the nitride film; partially etching the first oxide film located on the protruding portion of the semiconductor substrate, consequently exposing a tip of the protruding portion; epitaxially growing a thin line portion on an exposed region of the tip of the protruding portion of the semiconductor substrate; removing the nitride film and the first oxide film after the epitaxial growth of the thin line portion; and forming a quantum thin line isolated from the semiconductor substrate by a second oxide film formed by oxidizing the semiconductor substrate after the removal of the nitride film and the first oxide film.