Experimental studies on anisotropic thermoelectric properties and structures of n-type Bi2Te2.7Se0.3

Xiao Yan, Bed Poudel, Yi Ma, W. S. Liu, G. Joshi, Hui Wang, Yucheng Lan, Dezhi Wang, Gang Chen, Z. F. Ren

Research output: Contribution to journalArticle

380 Citations (Scopus)

Abstract

The peak dimensionless thermoelectric figure-of-merit (ZT) of Bi 2Te3-based n-type single crystals is about 0.85 in the ab plane at room temperature, which has not been improved over the last 50 years due to the high thermal conductivity of 1.65 W m-1 K-1 even though the power factor is 47 × 10-4 W m-1 K-2. In samples with random grain orientations, we found that the thermal conductivity can be decreased by making grain size smaller through ball milling and hot pressing, but the power factor decreased with a similar percentage, resulting in no gain in ZT. Reorienting the ab planes of the small crystals by repressing the as-pressed samples enhanced the peak ZT from 0.85 to 1.04 at about 125 °C, a 22% improvement, mainly due to the more increase on power factor than on thermal conductivity. Further improvement is expected when the ab plane of most of the small crystals is reoriented to the direction perpendicular to the press direction and grains are made even smaller.

Original languageEnglish (US)
Pages (from-to)3373-3378
Number of pages6
JournalNano letters
Volume10
Issue number9
DOIs
StatePublished - Sep 8 2010

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Thermal conductivity
thermal conductivity
Crystals
hot pressing
Ball milling
Hot pressing
pressing
figure of merit
crystals
balls
grain size
Single crystals
single crystals
room temperature
Temperature
Direction compound

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Yan, Xiao ; Poudel, Bed ; Ma, Yi ; Liu, W. S. ; Joshi, G. ; Wang, Hui ; Lan, Yucheng ; Wang, Dezhi ; Chen, Gang ; Ren, Z. F. / Experimental studies on anisotropic thermoelectric properties and structures of n-type Bi2Te2.7Se0.3. In: Nano letters. 2010 ; Vol. 10, No. 9. pp. 3373-3378.
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abstract = "The peak dimensionless thermoelectric figure-of-merit (ZT) of Bi 2Te3-based n-type single crystals is about 0.85 in the ab plane at room temperature, which has not been improved over the last 50 years due to the high thermal conductivity of 1.65 W m-1 K-1 even though the power factor is 47 × 10-4 W m-1 K-2. In samples with random grain orientations, we found that the thermal conductivity can be decreased by making grain size smaller through ball milling and hot pressing, but the power factor decreased with a similar percentage, resulting in no gain in ZT. Reorienting the ab planes of the small crystals by repressing the as-pressed samples enhanced the peak ZT from 0.85 to 1.04 at about 125 °C, a 22{\%} improvement, mainly due to the more increase on power factor than on thermal conductivity. Further improvement is expected when the ab plane of most of the small crystals is reoriented to the direction perpendicular to the press direction and grains are made even smaller.",
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Yan, X, Poudel, B, Ma, Y, Liu, WS, Joshi, G, Wang, H, Lan, Y, Wang, D, Chen, G & Ren, ZF 2010, 'Experimental studies on anisotropic thermoelectric properties and structures of n-type Bi2Te2.7Se0.3', Nano letters, vol. 10, no. 9, pp. 3373-3378. https://doi.org/10.1021/nl101156v

Experimental studies on anisotropic thermoelectric properties and structures of n-type Bi2Te2.7Se0.3. / Yan, Xiao; Poudel, Bed; Ma, Yi; Liu, W. S.; Joshi, G.; Wang, Hui; Lan, Yucheng; Wang, Dezhi; Chen, Gang; Ren, Z. F.

In: Nano letters, Vol. 10, No. 9, 08.09.2010, p. 3373-3378.

Research output: Contribution to journalArticle

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AU - Yan, Xiao

AU - Poudel, Bed

AU - Ma, Yi

AU - Liu, W. S.

AU - Joshi, G.

AU - Wang, Hui

AU - Lan, Yucheng

AU - Wang, Dezhi

AU - Chen, Gang

AU - Ren, Z. F.

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N2 - The peak dimensionless thermoelectric figure-of-merit (ZT) of Bi 2Te3-based n-type single crystals is about 0.85 in the ab plane at room temperature, which has not been improved over the last 50 years due to the high thermal conductivity of 1.65 W m-1 K-1 even though the power factor is 47 × 10-4 W m-1 K-2. In samples with random grain orientations, we found that the thermal conductivity can be decreased by making grain size smaller through ball milling and hot pressing, but the power factor decreased with a similar percentage, resulting in no gain in ZT. Reorienting the ab planes of the small crystals by repressing the as-pressed samples enhanced the peak ZT from 0.85 to 1.04 at about 125 °C, a 22% improvement, mainly due to the more increase on power factor than on thermal conductivity. Further improvement is expected when the ab plane of most of the small crystals is reoriented to the direction perpendicular to the press direction and grains are made even smaller.

AB - The peak dimensionless thermoelectric figure-of-merit (ZT) of Bi 2Te3-based n-type single crystals is about 0.85 in the ab plane at room temperature, which has not been improved over the last 50 years due to the high thermal conductivity of 1.65 W m-1 K-1 even though the power factor is 47 × 10-4 W m-1 K-2. In samples with random grain orientations, we found that the thermal conductivity can be decreased by making grain size smaller through ball milling and hot pressing, but the power factor decreased with a similar percentage, resulting in no gain in ZT. Reorienting the ab planes of the small crystals by repressing the as-pressed samples enhanced the peak ZT from 0.85 to 1.04 at about 125 °C, a 22% improvement, mainly due to the more increase on power factor than on thermal conductivity. Further improvement is expected when the ab plane of most of the small crystals is reoriented to the direction perpendicular to the press direction and grains are made even smaller.

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