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Ruiz-Clavijo, Alejandra; Caballero-Calero, Olga; Manzano, Cristina V.; Maeder, Xavier; Beardo, Albert; Cartoixà, Xavier; Álvarez, F. Xavier; Martín-González, Marisol
ACS applied energy materials, 12/2021, Letnik: 4, Številka: 12Journal Article
3D interconnected nanowire scaffoldings are shown to increase the thermoelectric efficiency in comparison to similar diameter 1D nanowires and films grown under similar electrodeposition conditions. Bi2Te3 3D nanonetworks offer a reduction in thermal conductivity (κT) while preserving the high electrical conductivity of the films. The reduction in κT is modeled using the hydrodynamic heat transport equation, and it can be understood as a heat viscosity effect due to the 3D nanostructuration. In addition, the Seebeck coefficient is twice that of nanowires and films, and up to 50% higher than in a single crystal. This increase is interpreted as a nonequilibrium effect that the geometry of the structure induces on the distribution function of the phonons, producing an enhanced phonon drag. These thermoelectric metamaterials have higher performance and are fabricated with large areas by a cost-effective method, which makes them suitable for up-scale production.
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