Solid-state thermoelectric coolers,which enable direct heat pumping by utilizing electricity,play an essential role in electronic refrigeration.Given that these devices usually cool down to the sub-ambient temperature...Solid-state thermoelectric coolers,which enable direct heat pumping by utilizing electricity,play an essential role in electronic refrigeration.Given that these devices usually cool down to the sub-ambient temperature range,their performance is critically dependent on the material properties at temperatures below 300 K.Consequently,enhancing the thermoelectric properties of materials at sub-ambient temperature is of paramount importance for advancing cooling technology.Herein,a single-crystalline Mg_(3)Bi_(2)-based material has been prepared and exhibits high electron mobility.As a result,thermoelectric figure-of-merit values of~1.05 at 300 K and~0.87 at 250 K(along the ab plane)have been achieved,which are superior to commercial n-type Bi_(2)(Te,Se)_(3).Thermoelectric coolers(single-and double-stage devices)based on the n-type single-crystalline Mg_(3)Bi_(1.497)Sb_(0.5)Te_(0.003)and p-type(Bi,Sb)_(2)Te_(3)have been fabricated.The double-stage cooler demonstrates a remarkable maximum cooling temperature difference of~106.8 K at the hot-side temperature of 350 K,surpassing the performance of commercial Bi_(2)Te_(3)-based devices.Notably,the Mg_(3)Bi_(2)-based doublestage device exhibits exceptional cyclic stability,maintaining its cooling performance without any observable degradation after approximately 2,000 cycles between the input currents of 1 and 3 A.These findings show that single-crystalline Mg_(3)Bi_(2)alloys hold great promise for thermoelectric cooling applications.展开更多
基金supported by the Key-Area Research and Development of Guangdong Province(2024B0101040002)the Shenzhen Science and Technology Program(KQTD20200820113045081)+11 种基金the GuangDong Basic and Applied Basic Research Foundation(2024B1515040022)support fromthe NationalNatural Science Foundation of China(52473298)the Shenzhen Science and Technology Program(RCJC20221008092725020)the Fundamental Research Funds for the Central Universities(2024FRFK03013)the StateKey Laboratory of Precision Welding&Joining of Materials and Structures(no.24-Z-14)the Shenzhen Stable Support Plan for Higher Education Institutions(GXWD20220818151757003)support from the National Natural Science Foundation of China for Distinguished Young Scholars(52425108)the National Natural Science Foundation of China(52172194)the Shenzhen Science and Technology Program(RCJC20210609103733073)support fromtheNationalNatural Science Foundation ofChina(52472196)support from the China Postdoctoral Science Foundation(2023M730841)the National Natural Science Foundation of China(12404046).
文摘Solid-state thermoelectric coolers,which enable direct heat pumping by utilizing electricity,play an essential role in electronic refrigeration.Given that these devices usually cool down to the sub-ambient temperature range,their performance is critically dependent on the material properties at temperatures below 300 K.Consequently,enhancing the thermoelectric properties of materials at sub-ambient temperature is of paramount importance for advancing cooling technology.Herein,a single-crystalline Mg_(3)Bi_(2)-based material has been prepared and exhibits high electron mobility.As a result,thermoelectric figure-of-merit values of~1.05 at 300 K and~0.87 at 250 K(along the ab plane)have been achieved,which are superior to commercial n-type Bi_(2)(Te,Se)_(3).Thermoelectric coolers(single-and double-stage devices)based on the n-type single-crystalline Mg_(3)Bi_(1.497)Sb_(0.5)Te_(0.003)and p-type(Bi,Sb)_(2)Te_(3)have been fabricated.The double-stage cooler demonstrates a remarkable maximum cooling temperature difference of~106.8 K at the hot-side temperature of 350 K,surpassing the performance of commercial Bi_(2)Te_(3)-based devices.Notably,the Mg_(3)Bi_(2)-based doublestage device exhibits exceptional cyclic stability,maintaining its cooling performance without any observable degradation after approximately 2,000 cycles between the input currents of 1 and 3 A.These findings show that single-crystalline Mg_(3)Bi_(2)alloys hold great promise for thermoelectric cooling applications.
