Research Project
Grant-in-Aid for Young Scientists (B)
The thermoelectric properties of heavily doped n-type and p-type single crystal Si were studied. A theoretical model based on the Boltzmann transport equation was developed from the experimentally observed data. A bulk nanocrystalline Si was synthesized by ball milling and spark plasma sintering. TEM observation showed that the grain size was around 50 nm. The thermal conductivity was reduced compared to that of the single crystal Si due to the enhanced phonon scattering at grain boundaries. Further reduction of the thermal conductivity was achieved by adding NiSi2 nanoparticles and Ge impurities. However, the thermoelectric performance was not improved compared to that of Si-Ge alloys. This result suggests that optimization of the sizes of the grains and nanoparticles are necessary to reduce the thermal conductivity significantly and enhance the thermoelectric performance.
All 2015 2014 2013
All Journal Article (1 results) (of which Peer Reviewed: 1 results, Acknowledgement Compliant: 1 results) Presentation (4 results)
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Volume: 印刷中
