Electronic and optical properties of quaternary selenides for optoelectronic applications: Insights from DFT+U‐computations. Issue 3 (19th October 2022)

• Record Type: Journal Article
• Authors: Azam, Sikandar; Imran, Muhammad; Rahman, Amin Ur; Nadeem, Asif; Neffati, Riadh
• Is Part Of: International journal of quantum chemistry. Volume 123:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-19
• Subjects: Brillouin zone -- electronic charge density -- new layered selenides materials -- optical properties -- orthorhombic space group; Quantum chemistry -- Periodicals; 541.28
• DOI: 10.1002/qua.27025
• Languages: English
• ISSNs: 0020-7608

Abstract

Abstract: The optical properties, electronic charge density, electronic structure of the new layered selenides materials, BaGdCuSe3, CsUCuSe3, CsZrCuSe3, and CsGdZnSe3 compounds have been calculated by using the full potential and linear augmented plane wave (FP‐LAPW) methods as applied in the WIEN2k package, which is based on the density functional theory. The ALnMSe3 compound's structure of these was (A = Cs, Ba; Ln = Zr, Gd, U; M = Cu, Zn) is composed of ( n = 1, 2) layers, which might be separated by A atoms. It is to be observed that there is strong hybridization between the s, p, and d states of Zr, Gd, and Cu atoms. Around the gadolinium atom, the charge density contours are completely circular, but the Gadolinium "Gd" atom shows an ionic nature. To calculate the refractive index, we used Kramer's Kronig correlations with the imaginary part dielectric function. The decrease in the refractive index is due to the lack of probability for direct excitation of the electrons, resulting in a loss of energy. The value of the static refractive index for all reference compounds is about 1.75–2.25, which is indication that the material used in optoelectronic devices. Abstract : Unit cell structure for BaGdCuSe3, CsUCuSe3, CsZrCuSe3, and CsGdZnSe3 .