期刊
APPLIED PHYSICS LETTERS
卷 119, 期 17, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0064662
关键词
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资金
- National Natural Science Foundation of China [61904091, 61775111, 61775109, 62074089]
- Zhejiang Provincial Natural Science Foundation of China [LY21F040003]
- K. C. Wong Magna Fund in Ningbo University, China
The study presents a thermally stable monatomic antimony (Sb) with enhanced amorphous thermal stability and high crystallization activation energy, making it a promising candidate for on-chip memory applications.
Elemental antimony (Sb) has been carried out recently as a phase-change material to overcome composition segregation in a heavily cycled memory cell. Explosive crystal growth of Sb is desirable for fast operation speed in memory; however, poor thermal stability, i.e., fast spontaneous crystallization at room temperature, significantly impedes its applications. In this work, we designed a thermal stability enhanced monatomic Sb in a specific confined structure of [Sb(3 nm)/SiO2(5 nm)](32) and investigated its crystallization kinetics by using the ultrafast differential scanning calorimetry method. It was found that this nanoscale Sb exhibits appealing amorphous thermal stability with a crystallization activation energy of 2.68 eV and the temperature for 10-year data retention more than 361 K. Moreover, strong non-Arrhenius crystallization behavior with a high fragility index of 90 was unrevealed in Sb supercooled liquids, which has the maximum crystal growth rate of 2.17 m s(-1) at 785 K. Thanks to the fast crystal growth rate and attractive thermal stability of this monatomic Sb, it could be one of the most important candidates for high-integrated on-chip memory without any composition segregation.
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