Jump to main content
Jump to site search

Issue 5, 2013
Previous Article Next Article

Enhanced thermoelectric properties of p-type nanostructured PbTe–MTe (M = Cd, Hg) materials

Author affiliations

Abstract

We investigated the effect of Cd and Hg substitution on the thermoelectric properties of p-type PbTe–x% CdTe and PbTe–x% HgTe (1 ≤ x ≤ 5) doped with Na2Te. Both ingot samples and spark plasma sintered (SPS) samples were studied and the properties are compared. We present detailed structural, spectroscopic and transmission electron microscopy (TEM) data, and transport properties of both cast ingot and SPS samples. The SPS processed samples with HgTe as the second phase show better thermoelectric properties than those with CdTe mainly because of more effective phonon scattering. The SPS process gives significantly lower lattice thermal conductivity for the p-type PbTe–HgTe system than the cast ingot. The same effect is not observed in the p-type PbTe–CdTe system. A maximum ZT of ∼1.64 at ∼770 K is achieved for the p-type PbTe–2% HgTe–1% Na2Te SPS sample. TEM studies reveal the formation of nanostructures whose number density generally increases with increasing concentrations of CdTe and HgTe as the second phase. Meso-scale grain boundaries along with nanostructured precipitates in the SPS samples play an important role in significantly reducing the lattice thermal conductivity compared to cast ingot in the case of p-type PbTe–HgTe.

Graphical abstract: Enhanced thermoelectric properties of p-type nanostructured PbTe–MTe (M = Cd, Hg) materials

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 Feb 2013, accepted on 19 Feb 2013 and first published on 18 Mar 2013


Article type: Paper
DOI: 10.1039/C3EE40482J
Citation: Energy Environ. Sci., 2013,6, 1529-1537
  •   Request permissions

    Enhanced thermoelectric properties of p-type nanostructured PbTe–MTe (M = Cd, Hg) materials

    K. Ahn, K. Biswas, J. He, I. Chung, V. Dravid and M. G. Kanatzidis, Energy Environ. Sci., 2013, 6, 1529
    DOI: 10.1039/C3EE40482J

Search articles by author

Spotlight

Advertisements