Assessment of the anharmonic phonon decay, Frohlich interactions, and phonon lifetime in Zn0.98Mn0.02S thin films through temperature-dependent Raman spectroscopy

This report accounts for the occurrence of the temperature-induced variation in the phonon properties and the spatial variation in the Raman spectra for the spray-deposited Zn0.98Mn0.02S thin films. The study of the temperature dependence of the Raman line position, line width, and the phonon lifetime using the theoretical models that consider the thermal expansion and three- and four-phonon anharmonic effects is the novelty of this work. The lifetime of the LO phonon in Zn0.98Mn0.02S thin film was as low as 0.234 ps, indicating material suitability for optical limiting applications. The intensity ratio I-2LO/I-1LO ranges within 0.5 at most of the (x, y) positions in the Raman mapping data, indicating the nanocrystalline nature of Zn0.98Mn0.02S.

Automated summary

This report discusses the temperature-induced variation in the phonon properties and the spatial variation in the Raman spectra for spray-deposited Zn0.98Mn0.02S thin films. The novelty of this work lies in the study of the temperature dependence of the Raman line position, line width, and phonon lifetime using theoretical models that consider thermal expansion and three- and four-phonon anharmonic effects. The lifetime of the LO phonon in the Zn0.98Mn0.02S thin film was as low as 0.234 ps, indicating its suitability for optical limiting applications. The intensity ratio I-2LO/I-1LO ranges around 0.5 in most (x, y) positions in the Raman mapping data, suggesting the nanocrystalline nature of Zn0.98Mn0.02S.