Assessing the thermoelectric properties of single InSb nanowires: The role of thermal contact resistance

S. Yazji, M.Y. Swinkels, M. De Luca, E.A. Hoffmann, D. Ercolani, S. Roddaro, G. Abstreiter, L. Sorba, E.P.A.M. Bakkers, I. Zardo

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Abstract

The peculiar shape and dimensions of nanowires (NWs) have opened the way to their exploitation in thermoelectric applications. In general, the parameters entering into the thermoelectric figure of merit are strongly interdependent, which makes it difficult to realize an optimal thermoelectric material. In NWs, instead, the power factor can be increased and the thermal conductivity reduced, thus boosting the thermoelectric efficiency compared to bulk materials. However, the assessment of all the thermoelectric properties of a NW is experimentally very challenging. Here, we focus on InSb NWs, which have proved to be promising thermoelectric materials. The figure of merit is accurately determined by using a novel method based on a combination of Raman spectroscopy and electrical measurements. Remarkably, this type of experiment provides a powerful approach allowing us to neglect the role played by thermal contact resistance. Furthermore, we compare the thermal conductivity determined by this novel method to the one determined on the same sample by the thermal bridge method. In this latter approach, the thermal contact resistance is a non-negligible parameter, especially in NWs with large diameters. We provide experimental evidence of the crucial role played by thermal contact resistance in the assessment of the thermal properties of nanostructures, using two different measurement methods of the thermal conductivity.

Original languageEnglish
Article number064001
Number of pages9
JournalSemiconductor Science and Technology
Volume31
Issue number6
DOIs
Publication statusPublished - 16 May 2016

Keywords

  • InSb
  • nanowires
  • TE figure of merit
  • thermal conductivity
  • thermal contact resistance
  • thermoelectric

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    Yazji, S., Swinkels, M. Y., De Luca, M., Hoffmann, E. A., Ercolani, D., Roddaro, S., Abstreiter, G., Sorba, L., Bakkers, E. P. A. M., & Zardo, I. (2016). Assessing the thermoelectric properties of single InSb nanowires: The role of thermal contact resistance. Semiconductor Science and Technology, 31(6), [064001]. https://doi.org/10.1088/0268-1242/31/6/064001