Role of Coherent Nanostructures and Mass Fluctuation on Thermoelectric Properties in Iodine Doped PbTe0.5Se0.5
Further development to achieve high value of the figure of merit in existing high performance thermoelectric materials necessitates reduction in thermal conductivity near the amorphous limit without affecting the high values of Seebeck coefficient and electrical conductivity. In this study, we have demonstrated the effect of coherently embedded nanostructures of PbTe/PbSe and mass fluctuation of Te and Se atoms on the thermoelectric properties in iodine doped PbTe0.5Se0.5. Compared to the pristine PbTe, the combined effect of coherent nanostructures and mass fluctuations of Te and Se atoms is found to reduce the thermal conductivity significantly with slight decrease in electron mobility paving the path for a high figure of merit.
KeywordsCoherent nanostructure Thermoelectricity Thermal conductivity Mobility
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One of the authors (PKR) acknowledges financial support from CSIR through CSIR (NET). The authors also acknowledge IOP Publishing Ltd. for allowing to re-use some of the content from the original article (i.e. P. K. Rawat, B. Paul and P. Banerji, Nanotechnology, 24, 215401 (2013), Copyright 2013, IOP Publishing Ltd.) in the present manuscript.