Heterogeneous Distribution of Sodium for High Thermoelectric Performance of p-type Multiphase Lead-Chalcogenides

AMINORROAYA YAMINI, Sima, MITCHELL, D.R.G., GIBBS, Z.M., SANTOS, R., PATTERSON, V., LI, S., PEI, Y.Z., DOU, S.X. and JEFFREY SNYDER, G. (2015). Heterogeneous Distribution of Sodium for High Thermoelectric Performance of p-type Multiphase Lead-Chalcogenides. Advanced Energy Materials, 5 (21).

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/aenm.20...
Link to published version:: 10.1002/aenm.201501047

Abstract

Despite the effectiveness of sodium as a p-type dopant for lead chalcogenides, its solubility is shown to be very limited in these hosts. Here, a high thermoelectric efficiency of ≈2 over a wide temperature range is reported in multiphase quaternary (PbTe)0.65(PbS)0.25(PbSe)0.1 compounds that are doped with sodium at concentrations greater than the solubility limits of the matrix. Although these compounds present room temperature thermoelectric efficiencies similar to sodium doped PbTe, a dramatically enhanced Hall carrier mobility at temperatures above 600 K for heavily doped compounds results in significantly enhanced thermoelectric efficiencies at elevated temperatures. This is achieved through the composition modulation doping mechanism resulting from heterogeneous distribution of the sodium dopant between precipitates and the matrix at elevated temperatures. These results can lead to further advances in designing high performance multiphase thermoelectric materials with intrinsically heterogeneous dopant distributions.

Item Type: Article
Additional Information: Unmapped bibliographic data: C7 - 1501047 [EPrints field already has value set] DB - Scopus [Field not mapped to EPrints] M3 - Article [Field not mapped to EPrints]
Research Institute, Centre or Group: Materials and Engineering Research Institute > Engineering Research
Identification Number: 10.1002/aenm.201501047
Depositing User: Sima Aminorroaya Yamini
Date Deposited: 26 Jul 2017 12:54
Last Modified: 26 Jul 2017 12:54
URI: http://shura.shu.ac.uk/id/eprint/15948

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