The effect on thermoelectric properties of Cd substitution in PbTe

Kyunghan Ahn; Mi Kyung Han; Derek Vermeulen; Steven Moses; Ctirad Uher; Mercouri G. Kanatzidis

doi:10.1557/proc-1166-n06-09

The effect on thermoelectric properties of Cd substitution in PbTe

Kyunghan Ahn, Mi Kyung Han, Derek Vermeulen, Steven Moses, Ctirad Uher, Mercouri G. Kanatzidis

Northwestern University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

A recent theoretical study suggested that the substitution of Cd in PbTe can result in a distortion in the electronic density of states (DOS) near the bottom of the conduction band in PbTe. In this study we explored the effect of Cd doping on the thermoelectric properties of PbTe in an effort to test the theoretical prediction that DOS distortion can increase the Seebeck coefficient. We present detailed investigation of structural and spectroscopic data, transmission electron microscopy, as well as transport properties of samples of PbI₂ doped PbTe-x% CdTe (x = 1, 3, 5, 7, 10). All samples follow the Pisarenko relationship and no enhancement of the Seebeck coefficient was observed due to DOS distortions. A low lattice thermal conductivity was achieved by nanostructuring observed via high resolution transmission electron microscopy. A maximum ZT of ∼1.2 at ∼720 K was achieved for the 1% CdTe sample.

Original language	English
Title of host publication	Materials and Devices for Thermal-to-Electric Energy Conversion
Publisher	Materials Research Society
Pages	177-182
Number of pages	6
ISBN (Print)	9781605111391
DOIs	https://doi.org/10.1557/proc-1166-n06-09
Publication status	Published - 2009
Event	2009 MRS Spring Meeting: Materials and Devices for Thermal-to-Electric Energy Conversion - San Francisco, CA, United States Duration: Apr 13 2009 → Apr 17 2009

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	1166
ISSN (Print)	0272-9172

Other

Other	2009 MRS Spring Meeting: Materials and Devices for Thermal-to-Electric Energy Conversion
Country	United States
City	San Francisco, CA
Period	4/13/09 → 4/17/09

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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The effect on thermoelectric properties of Cd substitution in PbTe. / Ahn, Kyunghan; Han, Mi Kyung; Vermeulen, Derek; Moses, Steven; Uher, Ctirad; Kanatzidis, Mercouri G.

Materials and Devices for Thermal-to-Electric Energy Conversion. Materials Research Society, 2009. p. 177-182 (Materials Research Society Symposium Proceedings; Vol. 1166).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ahn, K, Han, MK, Vermeulen, D, Moses, S, Uher, C & Kanatzidis, MG 2009, The effect on thermoelectric properties of Cd substitution in PbTe. in Materials and Devices for Thermal-to-Electric Energy Conversion. Materials Research Society Symposium Proceedings, vol. 1166, Materials Research Society, pp. 177-182, 2009 MRS Spring Meeting: Materials and Devices for Thermal-to-Electric Energy Conversion, San Francisco, CA, United States, 4/13/09. https://doi.org/10.1557/proc-1166-n06-09

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abstract = "A recent theoretical study suggested that the substitution of Cd in PbTe can result in a distortion in the electronic density of states (DOS) near the bottom of the conduction band in PbTe. In this study we explored the effect of Cd doping on the thermoelectric properties of PbTe in an effort to test the theoretical prediction that DOS distortion can increase the Seebeck coefficient. We present detailed investigation of structural and spectroscopic data, transmission electron microscopy, as well as transport properties of samples of PbI2 doped PbTe-x% CdTe (x = 1, 3, 5, 7, 10). All samples follow the Pisarenko relationship and no enhancement of the Seebeck coefficient was observed due to DOS distortions. A low lattice thermal conductivity was achieved by nanostructuring observed via high resolution transmission electron microscopy. A maximum ZT of ∼1.2 at ∼720 K was achieved for the 1% CdTe sample.",

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