Modulation of thermal conductivity and thermoelectric figure of merit by anharmonic lattice vibration in Sb₂Te₃ thermoelectrics

Diptasikha Das; K. Malik; Subarna Das; P. Singha; A. K. Deb; V. A. Kulbachinskii; Raktima Basu; Sandip Dhara; Arup Dasgupta; S. Bandyopadhyay; Aritra Banerjee

doi:10.1063/1.5053174

journal article·2018-12Open access

Modulation of thermal conductivity and thermoelectric figure of merit by anharmonic lattice vibration in Sb₂Te₃ thermoelectrics

Diptasikha Das, K. Malik, Subarna Das, P. Singha, A. K. Deb, V. A. Kulbachinskii, Raktima Basu, Sandip Dhara, Arup Dasgupta, S. Bandyopadhyay, Aritra Banerjee

AIP Advances· Volume 8· Issue 12

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Source abstract

Abstract

Anharmonic lattice vibration in metallic and semiconducting Sb2Te3 is investigated using temperature dependent Raman spectroscopic studies, synchrotron powder diffraction, and heat-capacity measurements. Thermal variation of structural parameters divulges temperature dependence of structural anisotropy in both the samples. It is revealed that semiconducting Sb2Te3, having higher defect density and larger phonon anharmonicity, possesses lower thermal conductivity. As compared to its metallic counterpart, significant increase in thermoelectric figure of merit, ZT is reported for the semiconducting Sb2Te3. Correlation among structural anisotropy, phonon anharmonicity and ZT is established.

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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Advanced Semiconductor Detectors and Materials · Thermal properties of materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Adamas University, Barasat - Barrackpore Road, Kolkata 700 126, India

Department of Physics, Vidyasagar Evening College, 39 Sankar Ghosh Lane, Kolkata 700 006, India

Department of Physics, University of Calcutta, 92 A P C Road, Kolkata 700 009, India

Department of Physics, Raiganj University, Uttar Dinajpur, West Bengal 733 134, India

Department of Low Temperature Physics and Superconductivity, Physics Faculty, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia

Surface and Nanoscience Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India

Physical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India

Center for Research in Nanoscience and Nanotechnology, University of Calcutta, JD-2, Sector-III, Saltlake, Kolkata 700 106, India

Funding

Department of Science and Technology, Ministry of Science and Technology · University Grants Commission

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