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First principle study of X2GaAgCl6 (X = Cs, Rb) double perovskites: structural, mechanical, vibrational, electronic, optical, SLME, thermoelectric, and thermodynamic properties for solar cell applications

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Abstract

The structural, mechanical, vibrational, electronic, optical, SLME, thermoelectric, and thermodynamic properties of X2GaAgCl6 (X = Cs, Rb), a double perovskite material, were computed by employing Density Functional Theory (DFT). CASTEP and Quantum ESPRESSO were used to perform first-principles calculations. X2GaAgCl6 possesses a cubic structure with the space-group symmetry Fm-3 m. The lattice parameters of Cs2GaAgCl6 and Rb2GaAgCl6 were optimized using the energy-volume curves, resulting in values of 7.357 Å and 7.365 Å, respectively. The population analysis confirmed the charge transfer among transition metals and halogen atoms. The stability of crystal X2GaAgCl6 (X = Cs, Rb) is effectively demonstrated by analyzing phonon dispersion curves with no negative frequencies. The band structure calculations indicated the semiconducting nature of compounds with energy gaps of 0.96 eV and 0.88 eV for Cs2GaAgCl6 and Rb2GaAgCl6, respectively. The optical characteristics results confirm that the examined materials are suitable for devices working, primarily in the electromagnetic spectrum’s visible region. SLME results showed that Cs2GaAgCl6 has 30% and Rb2GaAgCl6 has 27% efficiency, respectively, suggesting their use in photovoltaics. The thermoelectric properties of X2GaAgCl6 (X = Cs, Rb) were calculated by using the BoltzTraP code in the temperature range of 300 to 800 K. The quasi-harmonic Debye model was applied to calculate the thermodynamic characteristics.

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Authors would like to acknowledge all those who helped in the completion of this work.

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Conception and design of study: Zia ur Rehman, Muhammad Awais Rehman. Acquisition of data: Zia ur Rehman, Muhammad Awais Rehman, Muhammad Rizwan, Muhammad Usman, M. Chafi. Analysis and/or interpretation of data: Muhammad Awais Rehman, Muhammad Rashid Khan, Bushra Rehman, Surajudeen Sikiru,Muhammad Usman. Drafting the manuscript: Mohammed Chafi, Muhammad Usman, Surajudeen Sikiru, Muhammad Rashid Khan, Bushra Rehman, Muhammad Awais Rehman. Revising the manuscript critically for important intellectual content: Zia ur Rehman, Muhammad Awais Rehman, M. Chafi, Muhammad Rizwan. Approval of the version of the manuscript to be published: Zia ur Rehman, Muhammad Awais Rehman, M. Chafi, Muhammad Rizwan.

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Correspondence to Zia Ur Rehman.

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Rehman, Z.U., Rehman, M.A., Khan, M.R. et al. First principle study of X2GaAgCl6 (X = Cs, Rb) double perovskites: structural, mechanical, vibrational, electronic, optical, SLME, thermoelectric, and thermodynamic properties for solar cell applications. Environ Sci Pollut Res 31, 34881–34895 (2024). https://doi.org/10.1007/s11356-024-33556-8

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