Thermal Conductance of Thin Silicon Nanowires

Chen, Renkun; Hochbaum, Allon I.; Murphy, Padraig; Moore, Joel E.; Yang, Peidong; Majumdar, Arun

doi:10.1103/physrevlett.101.105501

Cited by 339 publications

(334 citation statements)

References 32 publications

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“…Measurements of the thermal conductivity of SiNWs were reported by Li et al (2003), who measured thermal conductivities more than two orders of magnitude lower than bulk from VLS-grown nanowires with relatively smooth surfaces of diameters ranging from 22 to 115 nm. More recent works by Chen et al (2008) and Doerk et al (2010) have confirmed these observations and proposed explanations based on phonon-boundary scattering in thin nanowires. Simultaneously, much computational effort has been devoted to the elucidation of heat transport phenomena in very thin SiNW.…”

Section: Heat Conduction In Si Nanowiressupporting

confidence: 60%

“…In particular, silicon nanowires (SiNW) have shown promise as components for nanoelectronic devices, thereby spurring extensive research into synthesis processes (Cui et al, 2001;Hochbaum et al, 2008) and fundamental thermal and electrical properties Shi et al, 2003;Chen et al, 2008;Doerk et al, 2010). In particular, these investigations have revealed a strong dependence of thermal conductivity on size and surface morphology (Cui et al, 2001).…”

Section: Heat Conduction In Si Nanowiresmentioning

confidence: 99%

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Atomistic long-term simulation of heat and mass transport

Venturini

Wang

Romero

et al. 2014

Journal of the Mechanics and Physics of Solids

114

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We formulate a theory of non-equilibrium statistical thermodynamics for ensembles of atoms or molecules. The theory is an application of Jayne's maximum entropy principle, which allows the statistical treatment of systems away from equilibrium. In particular, neither temperature nor atomic fractions are required to be uniform but instead are allowed to take different values from particle to particle. In addition, following the Coleman-Noll method of continuum thermodynamics we derive a dissipation inequality expressed in terms of discrete thermodynamic fluxes and forces. This discrete dissipation inequality effectively sets the structure for discrete kinetic potentials that couple the microscopic field rates to the corresponding driving forces, thus resulting in a closed set of equations governing the evolution of the system. We complement the general theory with a variational meanfield theory that provides a basis for the formulation of computationally tractable approximations. We present several validation cases, concerned with equilibrium properties of alloys, heat conduction in silicon nanowires and hydrogen desorption from palladium thin films, that demonstrate the range and scope of the method and assess its fidelity and predictiveness. These validation cases are characterized by the need or desirability to account for atomiclevel properties while simultaneously entailing time scales much longer than * Corresponding author E-mail address: ortiz@caltech.edu (M. Ortiz). September 27, 2014 those accessible to direct molecular dynamics. The ability of simple meanfield models and discrete kinetic laws to reproduce equilibrium properties and long-term behavior of complex systems is remarkable. Preprint submitted to Journal of the Mechanics and Physics of Solids

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Section: Heat Conduction In Si Nanowiressupporting

confidence: 60%

Section: Heat Conduction In Si Nanowiresmentioning

confidence: 99%

Atomistic long-term simulation of heat and mass transport

Venturini

Wang

Romero

et al. 2014

Journal of the Mechanics and Physics of Solids

114

View full text Add to dashboard Cite

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“…Following the microfabricated structures mentioned above, significant progress has been made in investigating the thermal conductivity in various one dimensional structures, such as SiNWs, [133][134][135] CNTs and boron nitride nanotubes, 44 75 in Ge-Si core-shell ultrathin NWs. 141,142 The development of suspended microfabricated structures for thermal properties measurement has paved the way for many significant studies in understanding the fundamental thermal transport at nanoscale.…”

Section: A 1d Nanostructuresmentioning

confidence: 99%

“…141,142 The development of suspended microfabricated structures for thermal properties measurement has paved the way for many significant studies in understanding the fundamental thermal transport at nanoscale. 44,71,133 Recently, by taking advantage of their advances in nanofabrication, Li and Thong managed to fabricate the MEMS in the size of 8 inches, with more than 600 devices integrated in one single wafer (insert in Fig. 11).…”

Section: A 1d Nanostructuresmentioning

confidence: 99%

Thermal transport in nanostructures

et al. 2012

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This review summarizes recent studies of thermal transport in nanoscaled semiconductors. Different from bulk materials, new physics and novel thermal properties arise in low dimensional nanostructures, such as the abnormal heat conduction, the size dependence of thermal conductivity, phonon boundary/edge scatterings. It is also demonstrated that phonons transport super-diffusively in low dimensional structures, in other words, Fourier's law is not applicable. Based on manipulating phonons, we also discuss envisioned applications of nanostructures in a broad area, ranging from thermoelectrics, heat dissipation to phononic devices.

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“…However, the NWs easily reach temperatures well above room temperature under the excitation with a focused laser beam; therefore, values of the thermal conductivity at temperatures over 320 K are necessary for solving the heat transfer in NWs. The limitation of the thermal conductivity of NWs is due to the phonon boundary scattering, therefore, the thermal conductivity is decreased when reducing the NW diameter, but also for rough surface NWs [9, 44,46,47]. Keeping all these considerations in mind, we have proceeded to calculate the thermal conductivity of Si NWs at temperatures above 320 K. For this, we have used a modified Callaway-Holland formalism [48], and we checked the model by the satisfactory fitting to the available experimental data on both smooth and rough NWs; for more details, see Anaya et al [48].…”

Section: The Thermal Conductivity Of Nwsmentioning

confidence: 99%

Study of the temperature distribution in Si nanowires under microscopic laser beam excitation

et al. 2012

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The use of laser beams as excitation sources for the characterization of semiconductor nanowires (NWs) is largely extended. Raman spectroscopy and photoluminescence (PL) are currently applied to the study of NWs. However, NWs are systems with poor thermal conductivity and poor heat dissipation, which result in unintentional heating under the excitation with a focused laser beam with microscopic size, as those usually used in microRaman and microPL experiments. On the other hand, the NWs have subwavelength diameter, which changes the optical absorption with respect to the absorption in bulk materials. Furthermore, the NW diameter is smaller than the laser beam spot, which means that the optical power absorbed by the NW depends on its position inside the laser beam spot. A detailed analysis of the interaction between a microscopic focused laser beam and semiconductor NWs is necessary for the understanding of the experiments involving laser beam excitation of NWs. We present in this work a numerical analysis of the thermal transport in Si NWs, where the heat source is the laser energy locally absorbed by the NW. This analysis takes account of the optical absorption, the thermal conductivity, the dimensions, diameter and length of the NWs, and the immersion medium. Both free standing and heat-sunk NWs are considered. Also, the temperature distribution in ensembles of NWs is discussed. This analysis intends to constitute a tool for the understanding of the thermal phenomena induced by laser beams in semiconductor NWs.

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Thermal Conductance of Thin Silicon Nanowires

Cited by 339 publications

References 32 publications

Atomistic long-term simulation of heat and mass transport

Atomistic long-term simulation of heat and mass transport

Thermal transport in nanostructures

Study of the temperature distribution in Si nanowires under microscopic laser beam excitation

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