Issue 30, 2024

Resonance-induced anomalies in temperature-dependent Raman scattering of PdSe2

Abstract

We report a comprehensive Raman study of the phonon behavior in PdSe2 in the temperature range of 5 K to 300 K. A remarkable change in the Raman spectrum is observed at 120 K: a significant enhancement of the out-of-plane phonon A1g mode, accompanied by a suppression of the in-plane A2g and B21g modes. This intriguing behavior is attributed to a temperature-dependent resonant excitation effect. The results are supported by density functional theory (DFT) calculations, which demonstrate that the electron–phonon coupling for the phonon modes varies and is strongly associated with the relevant electronic states. Furthermore, nonlinear frequency shifts are identified in all modes, indicating the decay of an optical phonon into multiple acoustic phonons. The study of Raman emission reported here, complemented by linear optical spectroscopy, reveals an unexpected scenario for the vibrational properties of PdSe2 that holds substantial promise for future applications in PdSe2-based optoelectronics.

Graphical abstract: Resonance-induced anomalies in temperature-dependent Raman scattering of PdSe2

Supplementary files

Article information

Article type
Paper
Submitted
16 5 2024
Accepted
24 6 2024
First published
24 6 2024
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2024,12, 11402-11411

Resonance-induced anomalies in temperature-dependent Raman scattering of PdSe2

O. Abdul-Aziz, D. Wolverson, C. J. Sayers, E. Carpene, F. Parmigiani, H. Hedayat and P. H. M. van Loosdrecht, J. Mater. Chem. C, 2024, 12, 11402 DOI: 10.1039/D4TC02012J

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