| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
2D Materials – Preparation, Properties, Modeling & Applications
|
| Presentation Title |
A Novel 2D van der Waals Phase-change Material Based on Transition-metal Binary Chalcogenide NbTe4 |
| Author(s) |
Yi Shuang, Qian Chen, Mihyeon Kim, Yinli Wang, Yuta Saito, Shogo Hatayama, Paul Fons, Daisuke Ando, Momoji Kubo, Yuji Sutou |
| On-Site Speaker (Planned) |
Yi Shuang |
| Abstract Scope |
Two-dimensional (2D) van der Waals (vdW) transition metal di-chalcogenides (TMDs) have gained attention in nonvolatile memory (NVM) due to their adjustable electrical properties, scalability, and potential for phase engineering. Sputtering shows promise for large-area 2D vdW TMD fabrication, but the high melting point (Tm > 1000 °C) of TMDs requires elevated temperatures for good crystallinity. This study focuses on low-melting 2D vdW TM tetra-chalcogenides (TMTs) and highlights NbTe4 as a favorable candidate with an ultra-low Tm of approximately 447 °C (onset temperature). As-deposited NbTe4 assumes an amorphous phase that can be crystallized through annealing above 272 °C. The coexistence of a low Tm and a high crystallization temperature Tc can address crucial challenges faced by current phase-change memory compounds, such as high Reset energies and poor thermal stability of the amorphous phase. Therefore, NbTe4 exhibits great potential as a viable solution to these issues. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Electronic Materials, Phase Transformations, Thin Films and Interfaces |