Phonon Conduction in Silicon Nanobeam Labyrinths.

Autor:	Park W; Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA., Romano G; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA., Ahn EC; Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA.; Department of Electrical and Computer Engineering, The University of Texas at San Antonio, San Antonio, TX, 78249, USA., Kodama T; Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA., Park J; Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA., Barako MT; Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA., Sohn J; Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA., Kim SJ; Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, 94305, USA., Cho J; Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA.; Department of Mechanical Engineering, Kyung Hee University, Yongin-si, 446-701, South Korea., Marconnet AM; School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, 47907, USA., Asheghi M; Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA., Kolpak AM; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA., Goodson KE; Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA. goodson@stanford.edu.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2017 Jul 24; Vol. 7 (1), pp. 6233. Date of Electronic Publication: 2017 Jul 24.
DOI:	10.1038/s41598-017-06479-3
Abstrakt:	Here we study single-crystalline silicon nanobeams having 470 nm width and 80 nm thickness cross section, where we produce tortuous thermal paths (i.e. labyrinths) by introducing slits to control the impact of the unobstructed "line-of-sight" (LOS) between the heat source and heat sink. The labyrinths range from straight nanobeams with a complete LOS along the entire length to nanobeams in which the LOS ranges from partially to entirely blocked by introducing slits, s = 95, 195, 245, 295 and 395 nm. The measured thermal conductivity of the samples decreases monotonically from ~47 W m -1  K -1 for straight beam to ~31 W m -1  K -1 for slit width of 395 nm. A model prediction through a combination of the Boltzmann transport equation and ab initio calculations shows an excellent agreement with the experimental data to within ~8%. The model prediction for the most tortuous path (s = 395 nm) is reduced by ~14% compared to a straight beam of equivalent cross section. This study suggests that LOS is an important metric for characterizing and interpreting phonon propagation in nanostructures.
Databáze:	MEDLINE
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