2. Articole

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Author: search.filters.author.Nika, DenisSubject: search.filters.subject.thermal conductivity

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    Thermal transport in semiconductor nanostructures, graphene, and related two-dimensional materials [Articol]
    (IOP Publishing Ltd, 2018) Cocemasov, Alexander.; Isacova, Calina; Nika, Denis
    We review experimental and theoretical results on thermal transport in semiconductor nanostructures (multilayer thin films, core/shell and segmented nanowires), single- and few-layer graphene, hexagonal boron nitride, molybdenum disulfide, and black phosphorus. Different possibilities of phonon engineering for optimization of electrical and heat conductions are discussed. The role of the phonon energy spectra modification on the thermal conductivity in semiconductor nanostructures is revealed. The dependence of thermal conductivity in graphene and related two-dimensional (2D) materials on temperature, flake size, defect concentration, edge roughness, and strain is analyzed.
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    Engineering of Thermal Fluxes in Phonon Mismatched Heterostructures [Articol]
    (American Scientific Publishers, 2009) Nika, Denis; Zincenco, N.D.; Pokatilov, E.P.
    The authors investigated theoretically the lattice thermal fluxes in planar three-layered heterostructures with inner silicon or germanium layer using the face-centered cubic cell dynamic lattice model. It has been established that the acoustically mismatched claddings significantly influence on the phonon spectra and thermal flux of heterostructures. The claddings with small sound velocity reduce average phonon velocity and decrease thermal flux in the nanostructure. The claddings with high sound velocity have an opposite effect. The predicted effects can be used for the engineering of the thermal properties of acoustically mismatched heterostructures and for the improving of the thermal management and thermoelectric properties of nanodevices.