Impacts of doping on thermal and thermoelectric properties of nanomaterials

Zhang, Gang; Li, Baowen

doi:10.1039/c0nr00095g

Cited by 149 publications

(91 citation statements)

References 130 publications

(157 reference statements)

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“…However, the experimentally observed 20% reduction in thermal conductivity is interesting to compare with the reduction obtained in other silicon-based nanostructures. On one hand, a stronger reduction was measured in silicon with pores (>50%) [9,18,19], nanodots (>70%) [13,68], polycrystalline grains (>80%) [15,69,70], dopants (>50%) [71,72] or germanium atoms (>70%) [14,71,73]. On the other hand, the 20% reduction by the pillars [63] is comparable to the reduction by holes (20–25%) [21,74] or slits (20–30%) [75] covering the same relative area.…”

Section: Experimental Measurements Of the Thermal Propertiesmentioning

confidence: 99%

Phonon and heat transport control using pillar-based phononic crystals

Anufriev

Nomura

2018

Science and Technology of Advanced Materials

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Phononic crystals have been studied for the past decades as a tool to control the propagation of acoustic and mechanical waves. Recently, researchers proposed that nanosized phononic crystals can also control heat conduction and improve the thermoelectric efficiency of silicon by phonon dispersion engineering. In this review, we focus on recent theoretical and experimental advances in phonon and thermal transport engineering using pillar-based phononic crystals. First, we explain the principles of the phonon dispersion engineering and summarize early proof-of-concept experiments. Next, we review recent simulations of thermal transport in pillar-based phononic crystals and seek to uncover the origin of the observed reduction in the thermal conductivity. Finally, we discuss first experimental attempts to observe the predicted thermal conductivity reduction and suggest the directions for future research.

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Section: Experimental Measurements Of the Thermal Propertiesmentioning

confidence: 99%

Phonon and heat transport control using pillar-based phononic crystals

Anufriev

Nomura

2018

Science and Technology of Advanced Materials

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“…Doping with isotopes atoms increases phonon scattering, thus results in reduction of thermal conductivity. 29 In 2008, Yang, Zhang and Li investigated the isotopic effect on thermal conductivity of SiNWs. 79 As shown in Fig.…”

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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“…Compared to the single component NWs, the physical properties of core-shell NWs can be further tailored by different compositions and different configurations, thus leading to various novel nanoscale electronic and optoelectronic devices [1][2][3]. In addition to the electronic and optical properties, thermal property of NWs has attracted more and more interests due to the potential thermoelectric applications in both power generation and refrigeration [4]. For instance, by etching the surface of silicon NWs, it has been experimentally demonstrated that thermal conductivity of Si NW can be reduced more than two orders of magnitude compared with bulk Silicon [5,6].…”

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confidence: 99%

Impacts of Atomistic Coating on Thermal Conductivity of Germanium Nanowires

2012

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By using non-equilibrium molecular dynamics simulations, we demonstrated that thermal conductivity of Germanium nanowires can be reduced more than 25% at room temperature by atomistic coating. There is a critical coating thickness beyond which thermal conductivity of the coated nanowire is larger than that of the host nanowire. The diameter dependent critical coating thickness and minimum thermal conductivity are explored. Moreover, we found that interface roughness can induce further reduction of thermal conductivity in coated nanowires. From the vibrational eigen-mode analysis, it is found that coating induces localization for low frequency phonons, while interface roughness localizes the high frequency phonons. Our results provide an available approach to tune thermal conductivity of nanowires by atomic layer coating. devices [1][2][3]. In addition to the electronic and optical properties, thermal property of NWs has attracted more and more interests due to the potential thermoelectric applications in both power generation and refrigeration [4]. For instance, by etching the surface of silicon NWs, it has been experimentally demonstrated that thermal conductivity of Si NW can be reduced more than two orders of magnitude compared with bulk Silicon [5,6]. Moreover, remarkable reduction of thermal conductivity in core-shell [7][8][9][10], tubular [11,12], and surface-decorated [13] NWs has also been reported through various kinds of interface and surface engineering.Previous studies [7][8][9] on the reduction of thermal conductivity in core-shell NWs mainly focus on Si/Ge core-shell NWs, which is quite intuitive as Ge is a low thermal conductivity material compared to Si [14]. However, in experimental realizations, the NWs synthesised are Ge/Si core-shell NWs [1][2][3]. Very recently, both theoretical and experimental works have shown that thermal conductivity of Ge/Si core-shell NWs can be lower than that of pure GeNWs with the same cross section area [15,16]. The reduction is caused by the localization of the longitudinal phonon modes induced by the coherent resonance effect between the transverse and longitudinal modes [15].Thus the core-shell structure offers the unique opportunity to further reduce thermal conductivity of low thermal conductivity material even by coating with high thermal conductivity material.Despite these recent progresses about the thermal properties of core-shell NWs, many important and fundamental issues remain unsolved. For example, in our recent 4 work [15], thermal conductivity of Ge/Si core-shell NW is compared with that of pure GeNW with the same entire cross section area. However, thermal conductivity of NW is sensitive to the surface-to-volume ratio (SVR) and increases with the cross section area [17,18]. Coating another material outside the host NW increases the cross section area and thus can lead to the increase of thermal conductivity. Therefore, to study the effect of coating on thermal conductivity from the experimental point of view, one should compare thermal cond...

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Impacts of doping on thermal and thermoelectric properties of nanomaterials

Cited by 149 publications

References 130 publications

Phonon and heat transport control using pillar-based phononic crystals

Phonon and heat transport control using pillar-based phononic crystals

Thermal transport in nanostructures

Impacts of Atomistic Coating on Thermal Conductivity of Germanium Nanowires

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