Patent ID: 8222625

Claim:
A non-volatile memory device comprising: a lower electrode; a phase-change material layer formed on the lower electrode so as to be electrically connected to the lower electrode, wherein the phase-change material layer comprises a phase-change material having a composition represented by at least one of Formulas 3, 4 and 7, below; and an upper electrode formed on the phase-change material layer so as to be electrically connected to the phase-change material layer; Sn X (Sb V Q (1-V) ) Y Te Z . [Formula 3] Sn X Sb Y (Te W Se (1-W) ) Z , [Formula 4] Sn X (Sb V Q (1-V) ) Y (Te W Se (1-W) ) Z , [Formula 7] where Q, when present, includes at least one of arsenic (As) and bismuth (Bi); 0≦V≦1; 0≦W≦1; 0.001≦X≦0.3; 0.001≦Y≦0.8; 0.1≦Z≦0.8; V+W<2; and X+Y+Z=1.