Mode- and space-resolved thermal transport of alloy nanostructures
نویسندگان
چکیده
Nanostructured semiconducting alloys obtain ultra-low thermal conductivity as a result of the scattering phonons with wide range mean-free-paths (MFPs). In these materials, long-MFP are scattered at nanoscale boundaries whereas short-MFP high-frequency impeded by disordered point defects introduced alloying. While this trend has been validated simplified analytical and numerical methods, an ab-initio space-resolved approach remains elusive. To fill gap, we calculate reduction in porous solving mode-resolved Boltzmann transport equation for using finite-volume approach. We analyze different alloys, length scales, concentrations, temperatures, obtaining very large over entire configuration space. For example, ∼97% is found Al0.8In0.2As 25% porosity. Furthermore, employ simulations to validate our recently “Ballistic Correction Model” (BCM), that estimates effective characteristic MFP bulk alloy length-scale material. The BCM then used provide guiding principles designing alloy-based nanostructures. Notably, it elucidates how such SixGe1−x larger compared Si or Ge, while also explaining why should not expect similar behavior AlxIn1−xAs. By taking into account synergy from route design materials conductivity.
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ژورنال
عنوان ژورنال: International Journal of Heat and Mass Transfer
سال: 2022
ISSN: ['1879-2189', '0017-9310']
DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2022.123191