Temperature-dependent thermal conductivities of 1D semiconducting nanowires via four-point-probe 3-ω method

Lee, Seung Yong; Lee, Mi Ri; Park, No Won; Kim, Gil Sung; Choi, Heon Jin; Choi, Tae-Youl; Lee, Sang Kwon

doi:10.1088/0957-4484/24/49/495202

Cited by 17 publications

(10 citation statements)

References 35 publications

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“…The diameter-dependent thermal conductivities of NW were carried out by a self-heating 3ω technique 11 20 21 which has been commonly employed to measure the thermal dynamic properties of NWs. In Fig.…”

Section: Resultsmentioning

confidence: 99%

In-situ Observation of Size and Irradiation Effects on Thermoelectric Properties of Bi-Sb-Te Nanowire in FIB Trimming

Chien

Lee

Tsai

et al. 2016

Sci Rep

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In this report, the thermoelectric properties of a Bi0.8Sb1.2Te2.9 nanowire (NW) were in-situ studied as it was trimmed from 750 down to 490 and 285 nm in diameter by a focused ion beam. While electrical and thermal conductivities both indubitably decrease with the diameter reduction, the two physical properties clearly exhibit different diameter dependent behaviors. For 750 and 490 nm NWs, much lower thermal conductivities (0.72 and 0.69 W/m-K respectively) were observed as compared with the theoretical prediction of Callaway model. The consequence indicates that in addition to the size effect, extra phonon scattering of defects created by Ga ion irradiation was attributed to the reduction of thermal conductivities. As the NW was further trimmed down to 285 nm, both the electrical and thermal conductivities exhibited a dramatic reduction which was ascribed to the formation of amorphous structure due to Ga ion irradiation. The size dependence of Seebeck coefficient and figure of merit (ZT) show the maximum at 750 nm, then decrease linearly with size decrease. The study not only provides the thoroughly understanding of the size and defect effects on the thermoelectric properties but also proposes a possible method to manipulate the thermal conductivity of NWs via ion irradiation.

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Section: Resultsmentioning

confidence: 99%

In-situ Observation of Size and Irradiation Effects on Thermoelectric Properties of Bi-Sb-Te Nanowire in FIB Trimming

Chien

Lee

Tsai

et al. 2016

Sci Rep

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“…and serve as model systems for which bulk properties are expected if surface properties are negligible. The thermal conductivity is determined by the

3 ω

‐method . Figure shows that the measured

U_{3 ω}

voltages of both NWs are proportional to

U_{1 ω}^{3}

.…”

Section: Resultsmentioning

confidence: 99%

Surface effects on thermoelectric properties of metallic and semiconducting nanowires

Kojda

Mitdank

Weidemann

et al. 2015

Physica Status Solidi (a)

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Metallic and semiconducting nanowires (NWs) are of interest in the field of thermoelectrics, because they act as model system to investigate the influence of surfaces on the thermoelectric transport properties. In single crystalline NWs, the grain boundary scattering is negligible and the surface‐to‐volume‐ratio is high. We present state‐of‐the‐art of the combination of the structural, chemical, and temperature‐dependent full thermoelectric characterization for individual single crystalline NWs, which is essential to conclude on surface effects. Temperature‐dependent measurements allow further conclusions on the scattering mechanisms. Simulations by the finite element method are performed on indented NWs to interpret the measurement results. Calculated surface temperature of a single‐indented and a multi‐indented NW.

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“…By measuring voltage variations at a frequency 3ω the temperature variations caused by the heating power can be measured and can be used to model the thermal conductance. This method has been applied to measure the thermal conductivity of bismuth [103], BiTe [104], Bi 0.8 Sb 1.2 Te 2.9 [105], Bi 0.5 Se 1.5 Te 3 [106], ZnO [107,108] and GaN [107] NWs. The advantages of this system are the automatic inclusion of electronic contacts and a relatively easy processing.…”

Section: Single Nwsmentioning

confidence: 99%

Nanowires for heat conversion

Swinkels¹,

Zardo²

2018

J. Phys. D: Appl. Phys.

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This review focuses on the investigation and enhancement of the thermoelectric properties of semiconducting nanowires (NWs). NWs are nanostructures with typical diameters between few to hundreds of nm and length of few to several µm, exhibiting a high surface-to-volume ratio. Nowadays an extraordinary control over their growth has been achieved, enabling also the integration of different type of heterostructures, which can lead to the engineering of the functional properties of the NWs. In this review we discuss all concepts which have been presented and achieved so far for the improvements of the thermoelectric performances of semiconducting NWs. Furthermore, we present a brief survey of the experimental methods which enable the investigation of the thermoelectric properties of these nanostructures.

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Temperature-dependent thermal conductivities of 1D semiconducting nanowires via four-point-probe 3-ω method

Cited by 17 publications

References 35 publications

In-situ Observation of Size and Irradiation Effects on Thermoelectric Properties of Bi-Sb-Te Nanowire in FIB Trimming

In-situ Observation of Size and Irradiation Effects on Thermoelectric Properties of Bi-Sb-Te Nanowire in FIB Trimming

Surface effects on thermoelectric properties of metallic and semiconducting nanowires

Nanowires for heat conversion

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