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Lattice Dynamics of Bi 1.9 Dy 0.1 Te 3 Topological Insulator

Physica B: Condensed Matter, ISSN: 0921-4526, Vol: 640, Page: 414050
2022
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  • Citations
    4
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      4
  • Captures
    5
  • Social Media
    206
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      206
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        206

Article Description

In this report, we have investigated the Density functional theory (DFT) calculation, temperature-dependent thermoelectric power and Raman spectroscopy of Bi 1.9 Dy 0.1 Te 3 topological insulator (TI). In this system, discrepancy due to the rare earth ion Dy initiates a Red-shift in Raman active modes in the Bi 2 Te 3 TI. Here, the lattice thermal conductivity (κ L ) was evaluated in the Umklapp scattering limit using the temperature dependency of the vibrational phonon modes and was used to evaluate the Figure of merit (ZT) of the system. It has been demonstrated that the estimated Power factor and ZT is very large, confirming the efficiency of Bi 1.9 Dy 0.1 Te 3 for better thermoelectric and electronic applications. Such immense thermoelectric power value of the corresponding system was further supported by the DFT calculation.

Bibliographic Details

Labanya Ghosh; Vinod K. Gangwar; Mahima Singh; Satya Vijay Kumar; Srishti Dixit; Sandip Chatterjee; Abhineet Verma; S. Saha; Durgesh Kumar Sharma; Sudhir Kumar; A. K. Ghosh

Elsevier BV

Materials Science; Physics and Astronomy; Engineering

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