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Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials


Probing the Melting Transitions in Phase-Change Superlattices via Thin Film Nanocalorimetry

DC Field Value Language Zhao, Jie ko Khan, Asir Intisar ko Efremov, Mikhail Y. ko Ye, Zichao ko Wu, Xiangjin ko Kim, Kangsik ko Lee, Zonghoon ko Wong, H. -S. Philip ko Pop, Eric ko Allen, Leslie H. ko 2023-08-03T05:16:09Z - 2023-08-02 ko 2023-05 ko
dc.identifier.citation NANO LETTERS, v.23, no.10, pp.4587 - 4594 ko
dc.identifier.issn 1530-6984 ko
dc.identifier.uri -
dc.description.abstract Phase-change superlattices with nanometer thin sublayers are promising for low-power phase-change memory (PCM) on rigid and flexible platforms. However, the thermodynamics of the phase transition in such nanoscale superlattices remain unexplored, especially at ultrafast scanning rates, which is crucial for our fundamental understanding of superlattice-based PCM. Here, we probe the phase transition of Sb2Te3 (ST)/Ge2Sb2Te5 (GST) superlattices using nanocalorimetry with a monolayer sensitivity (similar to 1 angstrom) and a fast scanning rate (10(5) K/s). For a 2/1.8 nm/nm Sb2Te3/GST superlattice, we observe an endothermic melting transition with an similar to 240 degrees C decrease in temperature and an similar to 8-fold decrease in enthalpy compared to those for the melting of GST, providing key thermodynamic insights into the low-power switching of superlattice-based PCM. Nanocalorimetry measurements for Sb2Te3 alone demonstrate an intrinsic premelting similar to the unique phase transition of superlattices, thus revealing a critical role of the Sb2Te3 sublayer within our superlattices. These results advance our understanding of superlattices for energy-efficient data storage and computing. ko
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Probing the Melting Transitions in Phase-Change Superlattices via Thin Film Nanocalorimetry ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85160002673 ko
dc.identifier.wosid 001011466000001 ko
dc.type.rims ART ko
dc.identifier.doi 10.1021/acs.nanolett.3c01049 ko
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