Abstract
The effect of K and K-Na substitution for Pb atoms in the rocksalt lattice of PbTe was investigated to test a hypothesis for development of resonant states in the valence band that may enhance the thermoelectric power. We combined high-temperature Hall-effect, electrical conductivity, and thermal conductivity measurements to show that K-Na codoping do not form resonance states but can control the energy difference of the maxima of the two primary valence subbands in PbTe. This leads to an enhanced interband interaction with rising temperature and a significant rise in the thermoelectric figure of merit of p -type PbTe. The experimental data can be explained by a combination of a single- and two-band models for the valence band of PbTe depending on hole density that varies in the range of 1-15× 1019 cm-3.
| Original language | English |
|---|---|
| Article number | 115209 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 82 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Sep 16 2010 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Thermoelectric enhancement in PbTe with K or Na codoping from tuning the interaction of the light- and heavy-hole valence bands. / Androulakis, John; Todorov, Iliya; Chung, Duck Young; Ballikaya, Sedat; Wang, Guoyu; Uher, Ctirad; Kanatzidis, Mercouri G.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 11, 115209, 16.09.2010.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Thermoelectric enhancement in PbTe with K or Na codoping from tuning the interaction of the light- and heavy-hole valence bands
AU - Androulakis, John
AU - Todorov, Iliya
AU - Chung, Duck Young
AU - Ballikaya, Sedat
AU - Wang, Guoyu
AU - Uher, Ctirad
AU - Kanatzidis, Mercouri G
PY - 2010/9/16
Y1 - 2010/9/16
N2 - The effect of K and K-Na substitution for Pb atoms in the rocksalt lattice of PbTe was investigated to test a hypothesis for development of resonant states in the valence band that may enhance the thermoelectric power. We combined high-temperature Hall-effect, electrical conductivity, and thermal conductivity measurements to show that K-Na codoping do not form resonance states but can control the energy difference of the maxima of the two primary valence subbands in PbTe. This leads to an enhanced interband interaction with rising temperature and a significant rise in the thermoelectric figure of merit of p -type PbTe. The experimental data can be explained by a combination of a single- and two-band models for the valence band of PbTe depending on hole density that varies in the range of 1-15× 1019 cm-3.
AB - The effect of K and K-Na substitution for Pb atoms in the rocksalt lattice of PbTe was investigated to test a hypothesis for development of resonant states in the valence band that may enhance the thermoelectric power. We combined high-temperature Hall-effect, electrical conductivity, and thermal conductivity measurements to show that K-Na codoping do not form resonance states but can control the energy difference of the maxima of the two primary valence subbands in PbTe. This leads to an enhanced interband interaction with rising temperature and a significant rise in the thermoelectric figure of merit of p -type PbTe. The experimental data can be explained by a combination of a single- and two-band models for the valence band of PbTe depending on hole density that varies in the range of 1-15× 1019 cm-3.
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U2 - 10.1103/PhysRevB.82.115209
DO - 10.1103/PhysRevB.82.115209
M3 - Article
VL - 82
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 11
M1 - 115209
ER -