Patent ID: 8237141

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 Formula 1, below; and an upper electrode formed on the phase-change material layer so as to be electrically connected to the phase-change material layer; (In U R (1-U) ) X (Sb V Q (1-V) ) Y (Te W Se (1-W) ) Z , [Formula 1] where R, when present, includes at least one of silicon (Si), and tin (Sn); Q, when present, includes at least one of arsenic (As) and bismuth (Bi); 0.001≦U≦1; 0≦V≦1; 0≦W≦1; 0.001≦X≦0.3; 0.001≦Y≦0.8; 0.001≦Z≦0.7; X+Y+Z=1; and at least one of the following is true: (i) V+W<2 and (ii) U<1 and R includes Si.