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Applied Physics Letters / Volume 96 / Issue 18 / ELECTRONIC TRANSPORT AND SEMICONDUCTORS

Appl. Phys. Lett. 96, 182104 (2010); http://dx.doi.org/10.1063/1.3427427 (3 pages)

p-type Bi0.4Sb1.6Te3 nanocomposites with enhanced figure of merit

Shufen Fan1, Junnan Zhao1, Jun Guo1, Qingyu Yan1, Jan Ma2, and Huey Hoon Hng1

1School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
2Temasek Laboratories, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553

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(Received 23 March 2010; accepted 16 April 2010; published online 6 May 2010)

We report enhanced figure of merit, ZT, in p-type Bi0.4Sb1.6Te3 nanocomposites fabricated by a rapid and high throughput method of mixing nanostructured Bi0.4Sb1.6Te3 particles obtained through melt spinning with micronsized particles obtained via solid state reaction. Due to effective scattering of phonons over a wide wavelength spectrum, low thermal conductivity, and moderately good power factor were obtained in the nanocomposites to achieve ZT above 1.5 at room temperature. A maximum ZT of 1.80 was attained at 43 °C for the nanocomposite consisting 40 wt % nanoinclusions. This was a 56% increment over the bulk sample, and the highest ZT reported for Bi2Te3-based materials.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

antimony compounds, bismuth compounds, inclusions, melt spinning, mixing, nanocomposites, nanofabrication, nanoparticles, phonons, semiconductor materials, thermal conductivity

PACS

  • 81.05.uj

    Diamond/nanocarbon composites

  • 61.46.Df

    Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

  • 64.70.Nd

    Structural transitions in nanoscale materials

  • 61.72.Qq

    Microscopic defects (voids, inclusions, etc.)

  • 66.70.Lm

    Other systems such as ionic crystals, molecular crystals, nanotubes, etc.

  • 63.22.-m

    Phonons or vibrational states in low-dimensional structures and nanoscale materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3427427

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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