Bidirectional-nonlinear threshold switching behaviors and thermally robust stability of ZnTe selectors by nitrogen annealing.

ABSTRACT: Three-dimensional stackable memory frames involving the integration of two-terminal scalable crossbar arrays are expected to meet the demand for high-density memory storage, fast switching speed, and ultra-low power operation. However, two-terminal crossbar arrays introduce an unintended sneak path, which inevitably requires bidirectional nonlinear selectors. In this study, the advanced threshold switching (TS) features of ZnTe chalcogenide material-based selectors provide bidirectional threshold switching behavior, nonlinearity of 10⁴, switching speed of less than 100 ns, and switching endurance of more than 10⁷. In addition, thermally robust ZnTe selectors (up to 400 ?) can be obtained through the use of nitrogen-annealing treatment. This process can prevent possible phase separation phenomena observed in generic chalcogenide materials during thermal annealing which occurs even at a low temperature of 250 ?. The possible characteristics of the electrically and thermally advanced TS nature are described by diverse structural and electrical analyses through the Poole-Frankel conduction model.

SUBMITTER: Jang G 

PROVIDER: S-EPMC7529746 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature