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Title: Weak-Bonding Elements Lead to High Thermoelectric Performance in BaSnS3 and SrSnS3: A First-Principles Study

Journal Article · · Chemistry of Materials

SnS2, an earth-abundant and ecofriendly material, is limited as a thermoelectric material because of the high lattice thermal conductivity κL and low carrier mobility μ. By introducing weak-bonding elements Ba or Sr into the SnS2 framework, we discovered two SnS2-based materials BaSnS3 and SrSnS3 with the calculated low κL values of 0.15 and 0.17 W m-1 K-1, respectively, along the a-axis. The low group velocity and high lattice anharmonicity originating from the weakened and distorted Sn–S bonding network are found in both systems. Moreover, the vibrations of Ba and Sr induce low-lying optical phonons, which strongly couple with the acoustic phonons and strengthen the phonon scattering rates. Compared to SnS2, both compounds present lower single-band effective masses, smaller deformation potential constants, and better band convergence, which enhance μ with an insignificantly reduced effective mass. By solving the linearized Boltzmann transport equation with a nonempirical carrier lifetime, we predict excellent ZT values of 2.89 and 2.77 along the a-axis at 900 K in BaSnS3 and SrSnS3, respectively. Further phase diagram calculations of Ba1–xSrxSnS3 solid solutions propose a new compound, Ba0.5Sr0.5SnS3, with an even higher ZT of 3.0. Our work analyzes explicitly how weak-bonding elements enhance μ and suppress κL simultaneously in SnS2-analogous systems with a series of compounds nominated as potential high-performance thermoelectric materials.

Research Organization:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Dept. of Commerce; National Key Research and Development Program of China; Natural Science Foundation of China; China Scholarship Council
Grant/Contract Number:
SC0014520; B07040; 2019YFA0704902; 70NANB14H012; 201906950054; 51521001; 51632006; 51872219; 51972256
OSTI ID:
1867613
Journal Information:
Chemistry of Materials, Vol. 34, Issue 3; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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