Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Anisotropic Optical And Vibrational Properties Of GeS

Natalia Zawadzka
ORCID logo ,
Łucja Kipczak
,
Tomasz Woźniak
ORCID logo ,
Katarzyna Olkowska-Pucko
,
Magdalena Grzeszczyk
,
Adam Babiński
,
Maciej R. Molas
* ORCID logo
Version 1 : Received: 29 October 2021 / Approved: 1 November 2021 / Online: 1 November 2021 (10:18:02 CET)

A peer-reviewed article of this Preprint also exists.

Zawadzka, N.; Kipczak, Ł.; Woźniak, T.; Olkowska-Pucko, K.; Grzeszczyk, M.; Babiński, A.; Molas, M.R. Anisotropic Optical and Vibrational Properties of GeS. Nanomaterials 2021, 11, 3109. Zawadzka, N.; Kipczak, Ł.; Woźniak, T.; Olkowska-Pucko, K.; Grzeszczyk, M.; Babiński, A.; Molas, M.R. Anisotropic Optical and Vibrational Properties of GeS. Nanomaterials 2021, 11, 3109.

Abstract

The optical response of bulk germanium sulfide (GeS) is investigated systematically using different polarization-resolved experimental techniques, such as photoluminescence (PL), reflectance contrast (RC), and Raman scattering (RS). It is shown that while the low-temperature (T=5 K) optical band-gap absorption is governed by a single resonance related to the neutral exciton, the corresponding emission is dominated by the disorder/impurity- and/or phonon-assisted recombination processes. Both the RC and PL spectra are found to be linearly polarized along the armchair direction. The low and room (T=300 K) temperature RS spectra consist of six Raman peaks identified with the help of Density Fuctional Theory (DFT) calculations: Ag1, Ag2, Ag3, Ag4, B1g1, and B1g2, which polarization properties are studied under four different excitation energies. We found that the polarization orientations of the Ag2 and Ag4 modes under specific excitation energy can be useful tools to determine the GeS crystallographic directions: armchair and zigzag.

Keywords

monochalcogenides; germanium sulfide; photoluminescence; reflectance contrast; excitons; Raman scattering; Density Fuctional Theory; phonons

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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