Patent ID: 6597036
Filing Date: 2003-07-22
Classification: B82Y,G11C,H01L

Abstract:
A multi-value single electron memory using a double quantum dot, comprising:a channel region having a width which is equal to or less than the Debye screen length, on a semiconductor substrate; a source and a drain doped with different impurities relative to impurities of the channel region, the source and the drain having the channel region between them; an insulating layer formed on the source, the drain and the channel region; first and second floating gates formed in the insulating layer on the source and the drain at respective ends of the channel region which act as quantum dots; and a control gate formed on the insulating layer which covers the first and second floating gates, wherein each of the first and second floating gates has a width which is equal to or smaller than the width of the channel, a thickness of 100 nm or less, and a diameter of 10 nm or less; and wherein the width, thickness and diameter of the first and second floating gates are reduced due to dielectric field oxidation, and both ends of each of the quantum dots are in the shape of a bird beak.