Effect of Nanoscale Surface Roughness and Electron-Phonon Interaction on Vibrational Modes of Cadmium Telluride Using Resonant Raman Spectroscopy.

Autor: Medel Ruiz CI; Centro Universitario de los Lagos, Universidad de Guadalajara, Lagos de Moreno, Jalisco, Mexico., Chiu R; Centro Universitario de los Lagos, Universidad de Guadalajara, Lagos de Moreno, Jalisco, Mexico., Casillas Rodríguez FJ; Centro Universitario de los Lagos, Universidad de Guadalajara, Lagos de Moreno, Jalisco, Mexico., Sevilla Escoboza JR; Centro Universitario de los Lagos, Universidad de Guadalajara, Lagos de Moreno, Jalisco, Mexico., Molina Contreras JR; Departamento de Ingeniería Eléctrica y Electrónica, Instituto Tecnológico de Aguascalientes, Aguascalientes, Aguascalientes, Mexico., Frausto Reyes C; Centro de Investigaciones en Óptica AC, Unidad Aguascalientes, Aguascalientes, Mexico.
Jazyk: angličtina
Zdroj: Applied spectroscopy [Appl Spectrosc] 2024 Nov; Vol. 78 (11), pp. 1164-1172. Date of Electronic Publication: 2024 Aug 02.
DOI: 10.1177/00037028241267938
Abstrakt: This study investigates the combined effects of nanoscale surface roughness and electron-phonon interaction on the vibrational modes of cadmium telluride (CdTe) using resonant Raman spectroscopy. Raman spectra simulations aided in identifying the active phonon modes and their dependence on roughness. Our results reveal that increasing surface roughness leads to an asymmetric line shape in the first-order longitudinal optical (1LO) phonon mode, attributed to an increase in the electron-phonon interaction. This asymmetry broadens the entire Raman spectrum. Conversely, the overtone (second-order longitudinal optical, or 2LO. mode exhibits a symmetrical line shape that intensifies with roughness. Additionally, we identify and discuss the contributions of surface optical phonon mode and multiphonon modes to the Raman spectra, highlighting their dependence on roughness. This work offers a deeper understanding of how surface roughness and electron-phonon scattering influence the line shape of CdTe resonant Raman spectra, providing valuable insights into its vibrational properties.
Competing Interests: Declaration of Conflicting InterestsThe authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
Databáze: MEDLINE