Título:
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Reconstructing phonon mean-free-path contributions to thermal conductivity using nanoscale membranes
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Autor/a:
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Cuffe, John; Eliason, Jeffrey Kristian; Maznev, Alex A.; Collins, Kimberlee C.; Johnson, Jeremiah A.; Shchepetov, Andrey; Prunnila, Mika; Ahopelto, Jouni; Sotomayor Torres, Clivia M.; Chen, Gang; Nelson, Keith A.
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Abstract:
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Knowledge of the mean-free-path distribution of heat-carrying phonons is key to understanding phonon-mediated thermal transport. We demonstrate that thermal conductivity measurements of thin membranes spanning a wide thickness range can be used to characterize how bulk thermal conductivity is distributed over phonon mean free paths. A noncontact transient thermal grating technique was used to measure the thermal conductivity of suspended Si membranes ranging from 15-1500 nm in thickness. A decrease in the thermal conductivity from 74-13% of the bulk value is observed over this thickness range, which is attributed to diffuse phonon boundary scattering. Due to the well-defined relation between the membrane thickness and phonon mean-free-path suppression, combined with the range and accuracy of the measurements, we can reconstruct the bulk thermal conductivity accumulation vs. phonon mean free path, and compare with theoretical models. |
Derechos:
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open access
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Tipo de documento:
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Article |
Editor:
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Uri:
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https://ddd.uab.cat/record/204928
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