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Realization of strain field origination via Sb substitution in naumannite Ag2Se for room temperature power generation

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Abstract

Silver selenide (Ag2Se) is considered as an excellent candidate to alter n-type Bi2Te3 for near-room-temperature thermoelectric applications owing to its distinctive transport properties, such as glass like thermal conductivity and intrinsically high electrical conductivity. This report summarizes the enhanced thermoelectric properties of Ag2Se via Antimony (Sb) incorporation. In this study, an energy and time efficient mechanical alloying process followed by hot press technique has been adopted to synthesize Ag2-xSbxSe (x = 0, 0.01, 0.02 & 0.03) samples. The XRD patterns confirmed the formation of orthorhombic structure of Ag2Se. The TG–DTA revealed the thermodynamic stability and the phase transition from semiconducting nature to superionic conducting nature of Ag2Se. The Sb substitution significantly improved the electrical transport properties and consequentially reduced the thermal transport properties, leads to the improved thermoelectric properties of Ag2Se. The enhanced electrical conductivity and Seebeck coefficient leads to a high-power factor of 925 µWm−1K−2 at 393 K for x = 0.01 sample. The effective scattering of phonons triggered by crystal imperfections due to Sb incorporation aids to obtain a low thermal conductivity of 0.8 W/mK. A maximum zT of 0.34 is obtained at 393 K for Ag2-xSbxSe sample with x = 0.02 via simultaneous modulation of electrical and thermal transport properties. The results indicates that, thermoelectric properties of Ag2Se can be improved through semi-metal incorporation.

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Acknowledgements

The authors acknowledge the Nanotechnology Research Centre (NRC) and Functional Materials and Energy Devices (FMED) laboratory for the experimental and characterization facilities. The authors thank the management of SRM Institute of Science and Technology for the support through SEED and STARTUP grant. The authors also thank DST SERB (CRG/2023/000352), CSIR-HRDG (03/ 1509/23/EMR-II), and DST-FIST [SR/FST/PS-II/2021/190(G)], Government of India, for financial support.

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Authors and Affiliations

  1. Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, India

    Tony Mathew, V. Vijay, R. Santhosh, S. Ponnusamy & M. Navaneethan

  2. Nanotechnology Research Centre (NRC), Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203, India

    E. Senthilkumar & M. Navaneethan

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Contributions

Tony Mathew: Conceptualization, Investigation, Methodology, Data curation, Writing—original draft; V. Vijay: Methodology, Software, Data curation, Writing—review & editing; R. Santhosh: Methodology, Formal analysis; E. Senthilkumar: Methodology, Formal analysis; S. Ponnusamy: Supervision, Resources, Writing—review, Formal analysis; M. Navaneethan: Supervision, Resources, Validation, Writing—review.

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Mathew, T., Vijay, V., Santhosh, R. et al. Realization of strain field origination via Sb substitution in naumannite Ag2Se for room temperature power generation. J Mater Sci: Mater Electron 35, 1321 (2024). https://doi.org/10.1007/s10854-024-13037-x

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