期刊
PHYSICAL REVIEW B
卷 87, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.045203
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资金
- Center for Revolutionary Materials for Solid State Energy Conversion
- US DOE, Office of Science, Office of Basic Energy Sciences [DE-SC0001054]
- UT-Battelle LLC, for the Department of Energy [DE-AC05000OR22725]
- EFRC
Experimental evidence is given relevant to the temperature dependence of the valence band structure of PbTe and PbTe1-xSx alloys ( 0.04 <= x <= 0.12), and its effect on the thermoelectric figure of merit ZT. The x = 0.08 sample has ZT similar to 1.55 at 773 K. The magnetic field dependence of the high-temperature Hall resistivity of heavily p-type (>10(19) cm(-3)) Na-doped PbTe1-xSx reveals the presence of high-mobility electrons. This casts doubts on prior analyses of the Hall coefficient suggesting that temperature induces a rapid rise in energy of the heavy hole relative to the light hole bands. The electron-like behavior is likely induced by the topology of the Fermi surface when the L- and Sigma-bands merge. Negative values for the low-temperature thermopower are also observed. The data show that PbTe continues to be a direct-gap semiconductor at temperatures where the ZT and S-2 sigma of p-type PbTe are optimal, e.g., 700-800 K. DOI: 10.1103/PhysRevB.87.045203
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