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Synergistically optimized thermoelectric properties of Ag1+xIn5Se8 alloys

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Abstract

The AgIn5Se8 diamond-like compound with low thermal conductivity is deemed to be a promising thermoelectric material, but its performance is limited by its low electrical conductivity. Herein, we report an effective method to increase the maximum and average zT values of AgIn5Se8-based compounds by adding excess Ag. All the samples exhibit increased carrier concentrations of ∼1018 cm−3 at ambient temperature, leading to considerably enhanced electrical conductivity. Meanwhile, the excess Ag creates numerous point defects, twin boundaries and stacking faults, which serve as the internal-strain field to induce additional phonon scattering and lattice softening to lower the lattice thermal conductivity. The synergistic strategy yields a peak zT value of 0.67 at 883 K and an average zT value of 0.34 from 323 to 883 K for Ag1.03In5Se8.

Graphical abstract: Synergistically optimized thermoelectric properties of Ag1+xIn5Se8 alloys

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Publication details

The article was received on 20 Aug 2019, accepted on 02 Oct 2019 and first published on 08 Oct 2019


Article type: Research Article
DOI: 10.1039/C9QI01054H
Inorg. Chem. Front., 2019, Advance Article

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    Synergistically optimized thermoelectric properties of Ag1+xIn5Se8 alloys

    X. Shen, B. Zhang, Q. Chen, H. Tan, X. Zhang, G. Wang, X. Lu and X. Zhou, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QI01054H

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