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Cu-based argyrodites have gained much attention as a new class ofthermoelectric materials for energy harvesting. However, the phase transitionoccurring in these materials and low energy conversion performance limitedtheir broad application in thermoelectric converters. In this work, we disclosea newly discovered highly efficient Cu8SiSxSe6-x argyrodite with stabilizedhigh-symmetry cubic phase at above 282 K opening the practical potential ofthis material for the mid-temperature region applications. The temperaturerange broadening of the high-symmetry phase existence was possible due to thesuccessful substitution of Se with S in Cu8SiSxSe6-x, which enhances theconfigurational entropy. The developed argyrodites show excellentthermoelectric performance thanks to the increased density of states effectivemass and ultralow lattice thermal conductivity. Further tuning of the carrierconcentration through the Cu-deviation improves the thermoelectric performancesignificantly. The dimensionless thermoelectric figure of merit ZT andestimated energy conversion efficiency {\eta} for Cu7.95SiS3Se3 achieveoutstanding values of the 1.45 and 13 %, respectively, offering this argyroditeas a low-cost and Te-free alternative for the thermoelectric energy conversionapplications.

Discovery of the high thermoelectric performance in low-cost Cu8SiSxSe6-x argyrodites