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• W3133544813 abstract "Superlattice-like phase change memory (SL-PCM) promises lower switching current than conventional PCM based on Ge2Sb2Te5 (GST). However, a fundamental understanding of SL-PCM requires detailed characterization of the interfaces within such a SL. Here, we explore the electrical and thermal transport of SLs with deposited Sb2Te3 and GeTe alternating layers of various thicknesses. We find up to ~4X reduction of the effective cross-plane thermal conductivity of the SL stack (as-deposited polycrystalline) compared to polycrystalline GST (as-deposited amorphous and later annealed) due to the thermal interface resistances within the SL. Thermal measurements with varying periods of our SLs show a signature of phonon coherence with a transition from wave-like to particle-like phonon transport, further described by our modeling. Electrical resistivity measurements of such SLs reveal strong anisotropy (~2000X) between the in-plane and cross-plane directions due to the weakly interacting van der Waals gaps. This work uncovers electro-thermal transport in SLs based on Sb2Te3 and GeTe, for improved design of low-power PCM." @default.
• W3133544813 created "2021-03-15" @default.
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• W3133544813 date "2021-07-16" @default.
• W3133544813 modified "2023-09-23" @default.
• W3133544813 title "Uncovering Thermal and Electrical Properties of Sb₂Te₃/GeTe Superlattice Films" @default.
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• W3133544813 doi "https://doi.org/10.1021/acs.nanolett.1c00947" @default.
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• W3133544813 hasPublicationYear "2021" @default.
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