Investigation study of optical and dielectric parameters using absorption and diffuse reflectance spectroscopy method on La0.57Nd0.1Sr0.13Ag0.2 MnO3 perovskite for optoelectronic application

• Published in: Optical and quantum electronics 2022-05, Vol.54 (5), Article 315
• Main Authors: Rejaiba, Omar, Khirouni, Kamel, Dhaou, Mohamed Houcine, Alzahrani, Bandar, Bouazizi, Mohamed Lamjed, Khelifi, Jabeur
• Format: Article
• Language: English
• Subjects: Absorption; Characterization and Evaluation of Materials; Computer Communication Networks; Dielectric properties; Diffuse reflectance spectroscopy; Electrical Engineering; Energy gap; Lasers; Optical Devices; Optical properties; Optics; Optoelectronics; Perovskites; Photonics; Physics; Physics and Astronomy; Refractivity; Spectra; Spectrum analysis
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-022-03633-8

Optical properties of a La 0.57 Nd 0.1 Sr 0.13 Ag 0.2 MnO 3 polycrystalline sample prepared by solid-state reaction were investigated. The FTIR spectra confirmed the formation of the structure of orthorhombic perovskite. Tauc method, spectra diffuse reflectance (DRS) spectroscopy and first derivative methods were used to found and confirm exactly the value of optical band gap energy (E g ) of La 0.57 Nd 0.1 Sr 0.13 Ag 0.2 MnO 3 . Results show an indirect bandgap energy of E gTau  = 3.20 eV,E gDRS  = 3.59 eV, E gdrivAbso= 3.29 eV and E gdrivRefel= 3.594 eV.This shift in E g value between Tauc method and spectra diffuse reflectance (DRS) spectroscopy is related to the lack of precision of Tauc’s method. Urbach energy, optical extinction coefficient and skin depth in function of the wavelength of the incident photon were determined and discussed based on the absorption and reflectance spectrum. The Refractive index (n), the dispersion energy (E 0 and E d ), zero-frequency refractive index (n 0 ), oscillator strength (S 0 ) and the oscillator wavelength (λ 0 ) values were found using Wemple–DiDomenico single-effective-oscillator model. Besides, the interband transition strength (J cv) , surface (SELF) and volume (VELF) energy loss function were evaluated from dielectric constant data of the La 0.57 Nd 0.1 Sr 0.13 Ag 0.2 MnO 3 sample In addition, the dielectric properties (ε*, σ*, tgδ, M* and Z*) and optical conductivity (σ op ) has been optically studied and discussed clearly. Finally, the obtained values by the three methods are compared and discussed. These analysis of La 0.57 Nd 0.1 Sr 0.13 Ag 0.2 MnO 3 compound may be a good candidate for optical devices.