Enhancement of the thermoelectric figure of merit of Si1−xGex quantum wires due to spatial confinement of acoustic phonons

Khitun, Alexander; Balandin, Alexander A.; Wang, K.L.; Chen, Gang

doi:10.1016/s1386-9477(00)00119-3

Cited by 26 publications

(20 citation statements)

References 17 publications

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“…3 shows the XRD patterns of the hotpressed samples with and without SbI 3 doping. The hot-pressed samples are mainly composed of Bi 2 (Te,Se) 3 …”

Section: Resultsmentioning

confidence: 99%

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Hydrothermally synthesized and hot-pressed Bi2(Te,Se)3 thermoelectric alloys

Zhu

Zhao

2005

Physica B: Condensed Matter

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“…3 shows the XRD patterns of the hotpressed samples with and without SbI 3 doping. The hot-pressed samples are mainly composed of Bi 2 (Te,Se) 3 …”

Section: Resultsmentioning

confidence: 99%

“…In bulk materials, however, the maximum efforts have been made to improve TE properties during the past decades. Synthesizing low-dimensional materials is a possible way of taking the quantum confinement effect into account [2,3]. A ZT value of 2.4 for a Bi 2 Te 3 /Sb 2 Te 3 superlattice has been reported [4].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermally synthesized and hot-pressed Bi2(Te,Se)3 thermoelectric alloys

Zhu

Zhao

2005

Physica B: Condensed Matter

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“…24,25,26,27,28 The thermoelectric phenomenon can be utilized to harvest otherwise wasted thermal energy directly into electric power. To increase the thermoelectric efficiency, the thermal conductivity in NWs should be reduced, which can be realized through phonon confinement effects, 29,30,31,32 isotope doping, 33 surface roughness, 34,35,36 or non-planar (kinked) structures. 37 Shi et al suggested enhancing the thermoelectric efficiency through gallium doping, and the thermoelectric figure of merit was found to be increased by a factor of 2.5 at 4% gallium doping.…”

Section: Introductionmentioning

confidence: 99%

Polar surface effects on the thermal conductivity of ZnO nanowires: a shell-like surface reconstruction-induced preserving mechanism

2013

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We perform molecular dynamics (MD) simulations to investigate the effect of polar surfaces on the thermal transport in zinc oxide (ZnO) nanowires. We find that the thermal conductivity in nanowires with free polar (0001) surfaces is much higher than in nanowires that have been stabilized with reduced charges on the polar (0001) surfaces, and also hexagonal nanowires without any transverse polar surfaces, where the reduced charge model has been proposed as a promising stabilization mechanism for the (0001) polar surfaces for ZnO nanowires. From normal mode analysis, we show that the higher thermal conductivity is due to a shell-like reconstruction that occurs for the free polar surfaces. This shell-like reconstruction suppresses twisting motion in the nanowires such that the bending phonon modes are not scattered by the other phonon modes, and leads to substantially higher thermal conductivity in the ZnO nanowire with free polar surfaces. Furthermore, the autocorrelation function of the normal mode coordinate is utilized to extract the phonon lifetime, which leads to a concise explanation for the higher thermal conductivity in ZnO nanowires with free polar surfaces. Our work demonstrates that ZnO nanowires without polar surfaces, which exhibit low thermal conductivity, are more promising candidates for thermoelectric applications than nanowires with polar surfaces (and also high thermal conductivity).

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“…Recent advances in the fabrication of nanodevices and the information showing nanodevices can work as thermal generators with high efficiency [12,13,14], have increased the importance of such studies. Indeed, violation of the WiedemannFranz low [15,16], ratio of the electrical conductance to the thermal conductance is proportional to the operating temperature, in nanodevices results in increase of the thermal efficiency and the figure of merit, ZT =…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric effects in a double quantum dot system weakly coupled to ferromagnetic leads

Tagani

Soleimani

2012

Solid State Communications

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Thermoelectric effects through a serial double quantum dot system weakly coupled to ferromagnetic leads are analyzed. Formal expressions of electrical conductance, thermal conductance, and thermal coefficient are obtained by means of Hubbard operators. Results show that although thermopower is independent of polarization of leads, figure of merit is reduced by increase of polarization. Influences of temperature and interdot tunneling on the figure of merit are also investigated, and observed that increase of the interdot tunneling strength results in reduction of the figure of merit. Effect of temperature on the thermal conductance is also analyzed.

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Enhancement of the thermoelectric figure of merit of Si1−xGex quantum wires due to spatial confinement of acoustic phonons

Cited by 26 publications

References 17 publications

Hydrothermally synthesized and hot-pressed Bi2(Te,Se)3 thermoelectric alloys

Hydrothermally synthesized and hot-pressed Bi2(Te,Se)3 thermoelectric alloys

Polar surface effects on the thermal conductivity of ZnO nanowires: a shell-like surface reconstruction-induced preserving mechanism

Thermoelectric effects in a double quantum dot system weakly coupled to ferromagnetic leads

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