Patent ID: 9543513
Date: 2017-01-10
CPC Classifications: C01B,C01P,H01L

Claim:
1. A variable resistance material layer, comprising germanium (Ge), antimony (Sb), tellurium (Te), and at least one type of impurities (X), wherein the variable resistance material layer has a composition represented by a chemical formula of X and wherein an atomic concentration of X is in a range of 0<p≦0.2, an atomic concentration of Ge is in a range of 0.05≦a<0.19, and an atomic concentration of Te is in a range of 0.42≦b≦0.56, wherein the variable resistance material layer has a shape of a pillar, wherein a sum of top and bottom surface areas of the pillar is defined as M and an area of a sidewall of the pillar is defined as D, and wherein D is equal to or more than three times that of M.