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Shen, Jiabin; Jia, Shujing; Shi, Nannan; Ge, Qingqin; Gotoh, Tamihiro; Lv, Shilong; Liu, Qi; Dronskowski, Richard; Elliott, Stephen R; Song, Zhitang; Zhu, Min
Science (American Association for the Advancement of Science), 2021-Dec-10, 2021-12-10, 20211210, Letnik: 374, Številka: 6573Journal Article
Nonvolatile phase-change memory has been successfully commercialized, but further density scaling below 10 nanometers requires compositionally and structurally homogeneous materials for both the memory cell and the associated vertically stacked two-terminal access switch. The selector switches are mostly amorphous-chalcogenide Ovonic threshold switches (OTSs), operating with a nonlinear current response above a threshold voltage in the amorphous state. However, they currently suffer from the chemical complexity introduced by the quaternary or even more diverse chalcogenide compositions used. We present a single-element tellurium (Te) volatile switch with a large (≥11 megaamperes per square centimeter) drive current density, ~10 ON/OFF current ratio, and faster than 20 nanosecond switching speed. The low OFF current arises from the existence of a ~0.95–electron volt Schottky barrier at the Te–electrode interface, whereas a transient, voltage pulse–induced crystal-liquid melting transition of the pure Te leads to a high ON current. Our discovery of a single-element electrical switch may help realize denser memory chips.
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