期刊
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
卷 31, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0268-1242/31/6/064001
关键词
thermoelectric; TE figure of merit; thermal conductivity; thermal contact resistance; nanowires; InSb
类别
资金
- Deutsche Forschungsgemeinschaft via the Excellence Cluster 'Nano-sytems Initiative Munich'
- TUM Institute for Advanced Study
- Foundation for Fundamental Research on Matter (FOM)
- NWO through the VENI grant [680-47-443]
- CNR through the bilateral projects CNR-RFBR
- Netherlands Organization for Scientific Research (NWO)
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.
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