Thermal diffusivity of SPS pressed silicon powders and the potential for using bottom–up silicon quantum dots as a starting material

Ashby, Shane P., Bian, Tiezheng, Ning, Huanpo, Reece, Michael J. and Chao, Yimin ORCID: https://orcid.org/0000-0002-8488-2690 (2015) Thermal diffusivity of SPS pressed silicon powders and the potential for using bottom–up silicon quantum dots as a starting material. Journal of Electronic Materials, 44 (6). pp. 1931-1935. ISSN 0361-5235

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Abstract

The production of nanostructured bulk materials from silicon powders has been well documented as being one way of bringing down the thermal conductivity of silicon while still maintaining its high power factor. This reduction of thermal conductivity is predicted to lead to significant increases in its figure-of-merit, ZT. The size of the starting particles has a major effect on the nanostructuring and grain size of the final silicon-based materials. Using particles of differing size and distribution, pellets were produced using spark plasma sintering. The results show a significant lowering in the thermal diffusivity as the particle size in the powders is decreased. As the starting particle size deceases from 1 μm to 60 nm, we see a tenfold decrease in the thermal diffusivity at 300 K, from 20 mm2 S−1 to 2 mm2 S−1. Both these show a significant decrease from the thermal diffusivity of 88 mm2 S−1 observed from bulk silicon. A further decrease to 1 mm2 S−1 is observed when the particle size of the starting material is decreased from 60 nm to sub-10 nm. The results also highlight the potential of using particles from solution approaches as a potential starting point for the prediction of nanostructured bulk materials.

Item Type:	Article
Uncontrolled Keywords:	silicon,nanoparticles,thermoelectric,spark plasma sintering,thermal conductivity
Faculty \ School:	Faculty of Science > School of Chemistry Faculty of Science
UEA Research Groups:	Faculty of Science > Research Groups > Physical and Analytical Chemistry (former - to 2017) Faculty of Science > Research Groups > Chemistry of Materials and Catalysis Faculty of Science > Research Groups > Energy Materials Laboratory
Depositing User:	Pure Connector
Date Deposited:	19 Dec 2015 07:06
Last Modified:	20 Jun 2023 09:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/55755
DOI:	10.1007/s11664-014-3599-y

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