In this study,we propose grain boundary engineering and nanostructuring to enhance the thermo-electric performance of SnTe through tri-doping with Mn,Ge,and Bi.The synergistic effects on the band structure were analyz...In this study,we propose grain boundary engineering and nanostructuring to enhance the thermo-electric performance of SnTe through tri-doping with Mn,Ge,and Bi.The synergistic effects on the band structure were analyzed through DFT calculations and validated through a series of doping experiments with each dopant.The nonstoichiometrically tri-doped sample exhibits a unique microstructure,characterized by Mn—Ge precipitates along the grain boundaries and coherently embedded nano-structures within the matrix.These microstructural features,combined with the effects of each dopant,synergistically enhanced the thermoelectric properties,yielding a maximum zT of 1.32 at 873 K.The thermoelectric generator exhibited a maximum output power of 661μW atΔT=485 K,confirming its viability for mid-temperature thermoelectric applications.展开更多
基金supported by grants from the National Research Foundation(NRF)of Korea,and funded by the Korean government(MSIT)(RS-2025-02223651)supported by the BK21 Four project funded by the Ministry of Education,Korea(2120231314753).
文摘In this study,we propose grain boundary engineering and nanostructuring to enhance the thermo-electric performance of SnTe through tri-doping with Mn,Ge,and Bi.The synergistic effects on the band structure were analyzed through DFT calculations and validated through a series of doping experiments with each dopant.The nonstoichiometrically tri-doped sample exhibits a unique microstructure,characterized by Mn—Ge precipitates along the grain boundaries and coherently embedded nano-structures within the matrix.These microstructural features,combined with the effects of each dopant,synergistically enhanced the thermoelectric properties,yielding a maximum zT of 1.32 at 873 K.The thermoelectric generator exhibited a maximum output power of 661μW atΔT=485 K,confirming its viability for mid-temperature thermoelectric applications.
