TY - GEN
T1 - High thermoelectric efficiency in co-doped degenerate p-type PbTe
AU - Androulakis, John
AU - Todorov, Ilyia
AU - Chung, Duck Young
AU - Ballikaya, Sedat
AU - Wang, Guoyu
AU - Uher, Ctirad
AU - Kanatzidis, Mercouri
PY - 2010
Y1 - 2010
N2 - We explored the effect of K and K-Na substitution for Pb atoms in the lattice of PbTe, in an effort to test a hypothesis for the development of a resonant state that may enhance the thermoelectric power. At 300K the data can adequately be explained by a combination of a single and two-band model for the valence band of PbTe depending on hole density that varies in the range 1-15 × 1019 cm-3. A change in scattering mechanism was observed in the temperature dependence of the electrical conductivity, σ, for samples concurrently doped with K and Na which results in significantly enhanced σ at elevated temperatures and hence power factors. Thermal conductivity data provide evidence of a strong interaction between the light- and the heavy-hole valence bands at least up to 500K. Figure of merits as high as 1.3 at 700K were measured as a result of the enhanced power factors.
AB - We explored the effect of K and K-Na substitution for Pb atoms in the lattice of PbTe, in an effort to test a hypothesis for the development of a resonant state that may enhance the thermoelectric power. At 300K the data can adequately be explained by a combination of a single and two-band model for the valence band of PbTe depending on hole density that varies in the range 1-15 × 1019 cm-3. A change in scattering mechanism was observed in the temperature dependence of the electrical conductivity, σ, for samples concurrently doped with K and Na which results in significantly enhanced σ at elevated temperatures and hence power factors. Thermal conductivity data provide evidence of a strong interaction between the light- and the heavy-hole valence bands at least up to 500K. Figure of merits as high as 1.3 at 700K were measured as a result of the enhanced power factors.
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U2 - 10.1557/proc-1267-dd04-03
DO - 10.1557/proc-1267-dd04-03
M3 - Conference contribution
AN - SCOPUS:78650389082
SN - 9781605112442
T3 - Materials Research Society Symposium Proceedings
SP - 75
EP - 80
BT - Thermoelectric Materials 2010 - Growth, Properties, Novel Characterization Methods and Applications
PB - Materials Research Society
ER -