Chalcopyrite ZnSnSb₂: A Promising Thermoelectric Material.

Area of Science:

• Materials Science
• Solid State Physics
• Thermoelectric Materials

Background:

• Ternary compounds with tetragonal chalcopyrite structure are promising thermoelectric (TE) materials.
• A lattice parameter ratio (c/a) of 2.00 is crucial for high TE performance due to enhanced valence band degeneracy.
• ZnSnSb2 exhibits a c/a ratio near 2.00, suggesting potential for high p-type figure of merit (zT).

Purpose of the Study:

• To synthesize single-phase ZnSnSb2, overcoming previous difficulties.
• To characterize the high-temperature thermoelectric properties of ZnSnSb2.
• To evaluate the potential of ZnSnSb2 as a high-performance thermoelectric material.

Main Methods:

• Synthesis of pure ZnSnSb2 using a Sn flux-based method.
• Characterization of thermoelectric properties up to 585 K.
• Analysis of transport properties and thermal behavior.

Main Results:

• Successful synthesis of impurity-free ZnSnSb2 samples.
• Confirmation of the chalcopyrite structure without order-disorder transitions up to 585 K.
• Demonstration of potential for high thermoelectric figure of merit (zT) in the low-to-mid temperature range.

Conclusions:

• Pure ZnSnSb2 can be synthesized effectively using a Sn flux method.
• ZnSnSb2 maintains its chalcopyrite structure at elevated temperatures.
• Further optimization of ZnSnSb2 holds promise for achieving high thermoelectric performance.