Thermoelectric performance of co-doped SnTe with resonant levels
- 25 July 2016
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 109 (4), 042102
- https://doi.org/10.1063/1.4959845
Abstract
Some group III elements such as Indium are known to produce the resonant impurity states in IV-VI compounds. The discovery of these impurity states has opened up new ways for engineering the thermoelectric properties of IV-VI compounds. In this work, resonant states in SnTe were studied by co-doping with both resonant (In) and extrinsic (Ag, I) dopants. A characteristic nonlinear relationship was observed between the Hall carrier concentration (nH) and extrinsic dopant concentration (NI, NAg) in the stabilization region, where a linear increase of dopant concentration does not lead to linear response in the measured nH. Upon substituting extrinsic dopants beyond a certain amount, the nH changed proportionally with additional dopants (Ag, I) (the doping region). The Seebeck coefficients are enhanced as the resonant impurity is introduced, whereas the use of extrinsic doping only induces minor changes. Modest zT enhancements are observed at lower temperatures, which lead to an increase in the average zT values over a broad range of temperatures (300–773 K). The improved average zT obtained through co-doping indicates the promise of fine carrier density control in maximizing the favorable effect of resonant levels for thermoelectric materials.This publication has 23 references indexed in Scilit:
- Extraordinary role of Hg in enhancing the thermoelectric performance of p-type SnTeEnergy & Environmental Science, 2014
- High Thermoelectric Performance of p-Type SnTe via a Synergistic Band Engineering and Nanostructuring ApproachJournal of the American Chemical Society, 2014
- Optimization of thermoelectric efficiency in SnTe: the case for the light bandPhysical Chemistry Chemical Physics, 2014
- High Performance Na-doped PbTe–PbS Thermoelectric Materials: Electronic Density of States Modification and Shape-Controlled NanostructuresJournal of the American Chemical Society, 2011
- Combination of large nanostructures and complex band structure for high performance thermoelectric lead tellurideEnergy & Environmental Science, 2011
- High Thermoelectric Performance in PbTe Due to Large Nanoscale Ag2Te Precipitates and La DopingAdvanced Functional Materials, 2010
- Exploring Resonance Levels and Nanostructuring in the PbTe−CdTe System and Enhancement of the Thermoelectric Figure of MeritJournal of the American Chemical Society, 2010
- Nanostructured Thermoelectrics: The New Paradigm?Chemistry of Materials, 2009
- Tin telluride based thermoelectrical alloysSemiconductors, 1998
- Anomalous Thermoelectric Power as Evidence for Two-Valence Bands in SnTePhysical Review B, 1963