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Pàgina inicial > Articles > Articles publicats > Reconstructing phonon mean-free-path contributions to thermal conductivity using nanoscale membranes |
Data: | 2015 |
Resum: | 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. |
Ajuts: | European Commission 309150 Ministerio de Economía y Competitividad MAT2012-31392 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Publicat a: | Physical review B : Condensed matter and materials physics, Vol. 91, Issue 24 (June 2015) , art. 245423, ISSN 1550-235X |
Postprint 23 p, 540.5 KB |