Abstract
The substantial exploration of novel lead-free, non-toxic double perovskite halide (DPH) materials with suitable band gaps and high stability is desirable for modern perspective applications. In this work, we report density functional theory (DFT) calculations to screen the structural, dynamical, and mechanical stability, tuning the band gap, and optical properties of inorganic Cs2RbABr6 (A = Tl and Bi) DPH materials using WIEN2K quantum mechanical simulation code. The computation of tolerance factor, octahedral factor, and phonon band structures shows that the interested materials possess dynamic and structural stability in cubic symmetry. The computed cubic elastic constants Cij, bulk modulus B, Young’s modulus Y, shear modulus G, Cauchy pressure CP, Pugh ratio \(\frac{B}{G}\), anisotropy factor A, and Poisson ratio ʋ confirm that both ternary Cs2RbTlBr6 and Cs2RbBiBr6 DPH materials are anisotropic, ductile, tough, and mechanically stable. Electronic properties depict that the tuning of the direct band gap (2.26 eV) from Γ–Γ in the Cs2RbTlBr6 to the direct band gap of 4.09 eV from L–L occurs in Cs2RbBiBr6 when the transition element Thallium (Tl) is replaced by the non-metallic Bismuth (Bi) element. The electronic properties show that Cs2RbTlBr6 is a semiconductor and Cs2RbBiBr6 is an insulator. Our investigations of optical properties show that inorganic Cs2RbABr6 (A = Tl and Bi) DPH possess better absorption coefficient, optical conductivity, and refractive index in the visible light spectrum, and thus Cs2RbTlBr6 and Cs2RbBiBr6 are proposed to be efficient materials for photosensitive and renewable energy applications.
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Acknowledgements
The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University Abha 61421, Asir, Kingdom of Saudi Arabia for funding this work through the Large Groups Project under Grant No. RGP.2/448/44.
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Deanship of Scientific Research at King Khalid University Abha 61421, Asir, Kingdom of Saudi Arabia through the Large Groups Project under Grant No. RGP.2/448/44.
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MH, NR, AA-R, VT, HU, and ME—wrote the manuscript. FA, MU, AA, QH, and JL—prepared figures. RA and AH—helped us in revision. All the authors reviewed the manuscript.
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Husain, M., Rahman, N., Azzouz-Rached, A. et al. Screening the structural, dynamical, and mechanical stability, tuning band gaps, and optical properties of inorganic Cs2RbABr6 (A = Tl and Bi) double perovskites halide using DFT calculations. Opt Quant Electron 56, 866 (2024). https://doi.org/10.1007/s11082-024-06704-0
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DOI: https://doi.org/10.1007/s11082-024-06704-0