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Researchers enhanced tin selenide (SnSe) thermoelectric performance by adding tellurium (Te). This modification achieved a record ZT value of ~1.6, boosting energy conversion efficiency in thermoelectric materials.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Energy Conversion

Background:

  • Tin selenide (SnSe) is recognized for its thermoelectric potential due to inherent anharmonicity and multiple valence bands.
  • Optimizing SnSe performance is crucial for advancing thermoelectric energy conversion technologies.

Purpose of the Study:

  • To enhance the thermoelectric figure of merit (ZT) of p-type SnSe crystals.
  • To investigate the effects of tellurium (Te) alloying on SnSe crystal structure and thermoelectric properties.

Main Methods:

  • Synthesis of Te-alloyed SnSe crystals.
  • Measurement of thermoelectric properties (ZT, power factor, Seebeck coefficient, thermal conductivity) from 300 K to 793 K.
  • Electron localization function calculations and Callaway model analysis.
  • Structural characterization using aberration-corrected scanning transmission electron microscopy.

Main Results:

  • Achieved a record-high average ZT value of ~1.6 across the temperature range of 300-793 K, with a peak ZT of 2.1 at 793 K.
  • Observed a significant enhancement in power factor, reaching ~55 μW cm-1 K-2 at 300 K, attributed to increased carrier mobility and sharpened valence bands.
  • Demonstrated a reduction in lattice thermal conductivity due to Te alloying promoting tin atom displacements and structural disorder.

Conclusions:

  • Te alloying effectively enhances the thermoelectric performance of SnSe by optimizing both the power factor and lattice thermal conductivity.
  • The strategy of modifying crystal structures through alloying offers a promising route for improving thermoelectric materials, particularly low-symmetry ones.
  • This work presents a new avenue for designing advanced thermoelectric materials for efficient energy conversion.