First-principles thermal transport in amorphous Ge₂Sb₂Te₅ at the nanoscale.

ABSTRACT: Achieving a precise understanding of nanoscale thermal transport in phase change materials (PCMs), such as Ge₂Sb₂Te₅ (GST), is the key of thermal management in nanoelectronics, photonic and neuromorphic applications using non-volatile memories. By resorting to a first-principles approach to calculate the thermal conductivity of amorphous GST, we found that size effects and heat transport via propagative modes persist well beyond extended range order distances typical of disordered network-forming materials. Values obtained are in quantitative agreement with the experimental data, by revealing a strong size dependence of the thermal conductivity down to the 1.7-10 nm range, fully covering the scale of current PCMs-based devices. In particular, a reduc

SUBMITTER: Duong TQ 

PROVIDER: S-EPMC8695776 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature