Microstructural iterative reconstruction toward excellent thermoelectric performance in MnTe

Luo，Yiyuan1; Wang，Jinghan1; Yang，Jianmin1; Mao，Dasha1; Cui，Juan3; Jia，Baohai1; Liu，Xusheng4; Nielsch，Kornelius2; Xu，Xiao2; He，Jiaqing1

2023

10.1039/d3ee01902k

Energy and Environmental Science   Impact Factor & Quartile

1754-5692

1754-5706

Earth-abundant manganese telluride (MnTe) with a hexagonal structure has shown significant thermoelectric conversion potential; however, the drawbacks of low carrier concentration and low mobility have limited its application. Herein, we constructed a type of layer structure by fabricating polycrystalline MnSbTe, increasing the hole density by 100 times. The introduced van der Waals gaps effectively enhanced the phonon scattering, further suppressing the intrinsic low thermal conductivity. The reduced hole concentration in the Ge-doped MnSbTe-based specimens, verified by both theoretical calculations and experimental characterization studies, was unexpectedly found to enhance mobility by reducing the intervalley scattering of carriers, resulting in a record high average ZT value of 0.71 from 300 K to 823 K and an excellent peak ZT value of 1.3 at 823 K. Hence, an MnGeSbTe-based single stage generating module was successfully assembled with a competitive performance of 0.81 W (0.45 W cm) and 4.6% over a temperature gradient of 480 K. This tailored investigation created an outstanding MnTe-based specimen, which could serve as a candidate for application in thermoelectric generators.

SCI

English

First ; Corresponding

National Natural Science Foundation of China["11934007","11874194"] ; Science and Technology Innovation Committee Foundation of Shenzhen["JCYJ20200109141205978","ZDSYS20141118160434515"] ; Special Funds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation[pdjh2022c0091]

Chemistry ; Energy & Fuels ; Engineering ; Environmental Sciences & Ecology

Chemistry, Multidisciplinary ; Energy & Fuels ; Engineering, Chemical ; Environmental Sciences

WOS:001041269700001

ROYAL SOC CHEMISTRY

2-s2.0-85167516635

Scopus

1.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
2.Institute for Metallic Materials,Leibniz Institute for Solid State and Materials Research,Dresden,01069,Germany
3.Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,Beijing,100088,China
4.Shenzhen Institute for Advanced Study,University of Electronic Science and Technology of China,Shenzhen,518110,China

Luo，Yiyuan,Wang，Jinghan,Yang，Jianmin,et al. Microstructural iterative reconstruction toward excellent thermoelectric performance in MnTe[J]. Energy and Environmental Science,2023,16(9).

Luo，Yiyuan.,Wang，Jinghan.,Yang，Jianmin.,Mao，Dasha.,Cui，Juan.,...&He，Jiaqing.(2023).Microstructural iterative reconstruction toward excellent thermoelectric performance in MnTe.Energy and Environmental Science,16(9).

Luo，Yiyuan,et al."Microstructural iterative reconstruction toward excellent thermoelectric performance in MnTe".Energy and Environmental Science 16.9(2023).