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HgTe: a potential thermoelectric material in the cinnabar phase
1National Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.
The Journal of Chemical Physics
|May 27, 2008
Summary
N-doped cinnabar HgTe exhibits superior thermoelectric properties compared to the zinc-blende phase due to its structural anisotropy. This suggests cinnabar HgTe as a promising thermoelectric material.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Thermoelectric materials convert heat energy into electrical energy.
- Mercury telluride (HgTe) exists in different crystallographic phases, including zinc-blende (ZB) and cinnabar.
- Understanding phase-dependent properties is crucial for material design.
Purpose of the Study:
- To investigate the electronic structure and transport properties of HgTe in its zinc-blende and cinnabar phases.
- To evaluate the potential of cinnabar HgTe as a thermoelectric material.
- To elucidate the origins of anisotropic thermoelectric behavior.
Main Methods:
- Full-potential linearized augmented plane-wave (FP-LAPW) method for electronic structure calculations.
- Semiclassical Boltzmann theory for transport property analysis.
- Comparative study of ZB and cinnabar HgTe phases.
Main Results:
- N-doped cinnabar HgTe shows significantly higher Seebeck coefficient and electrical conductivity along the z-axis compared to n-doped ZB HgTe.
- Structural anisotropy in cinnabar HgTe, arising from chainlike bonding, leads to anisotropic energy distribution in the conduction band.
- Predicted ZT values for n-doped cinnabar HgTe reach 0.61 at room temperature and 1.74 at 600 K along the z-axis.
Conclusions:
- Cinnabar HgTe demonstrates excellent potential as a thermoelectric material, particularly along the z-axis.
- The observed high ZT values are attributed to the unique anisotropic electronic structure of the cinnabar phase.
- Experimental validation is recommended to explore the predicted high thermoelectric performance of cinnabar HgTe.
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