Issue 18, 2023

Raman spectroscopy of a few layers of bismuth telluride nanoplatelets

Abstract

We can shape the electronic and phonon properties of Bi2Te3 crystals via the variation of the number of layers. Here, we report a Raman study with the aid of first-principles calculations on few-layered Bi2Te3 systems ranging from 5 to 24 nm layer thickness using 1.92, 2.41 and 2.54 eV excitation energies. We examine how the frequency position, intensity and lineshape of the main Raman modes (A11g, E2g, and A21g) behave by the variation of the layer thickness and excitation energy. We observed a frequency dispersion on the number of layers of the main modes, indicating changes in the inter- and intra-layers interaction. A resonant Raman condition is reached for all modes for samples with 11 and 18 nm thickness because of van Hove singularities at the electronic density of states. Also, the Breit–Wigner–Fano line shape of the A21g mode shows an increase of electron–phonon coupling for thick layers. These results suggest a relevant influence of numbers of layers on the Raman scattering mechanics in Bi2Te3 systems.

Graphical abstract: Raman spectroscopy of a few layers of bismuth telluride nanoplatelets

Supplementary files

Article information

Article type
Paper
Submitted
14 محرم 1445
Accepted
02 صفر 1445
First published
06 صفر 1445
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2023,5, 5131-5136

Raman spectroscopy of a few layers of bismuth telluride nanoplatelets

V. Carozo, B. R. Carvalho, S. H. Safeer, L. Seixas, P. Venezuela and M. Terrones, Nanoscale Adv., 2023, 5, 5131 DOI: 10.1039/D3NA00585B

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party commercial publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements