Insights into the Optoelectronic and Thermoelectric Properties of Lead-Free Rb2NaIrF6 Double Perovskite Compound: A First-Principles Study.
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Date
2025-07-01
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Publisher
Elsevier B.V
Abstract
This study investigated the structural, electronic, elastic, mechanical, thermodynamic,
optical, and thermoelectric properties of the Rb2NaIrF6 lead-free double perovskite
compound using first-principles methods. The structural stability of the perovskite was
confirmed by the Goldschmidt tolerance and octahedral factors. Dynamic stability was
confirmed through the negative energy of formation and positive frequency modes of
the phonon dispersion curve. The dynamic stability results suggest that the studied
compound could be potentially synthesised experimentally. The Rb2NaIrF6 compound
is a direct semiconductor with electronic band gaps within the range of 2.14-3.76 eV,
computed using different approximations. The mechanical stability was confirmed by
the elastic calculation results. The Rb2NaIrF6 compound was found to be ductile, ionic,
and anisotropic. The optical properties showed that Rb2NaIrF6 strongly absorbs light
in the ultraviolet region, which is desirable for ultraviolet-photosensitive materials in
optoelectronic devices. The computed thermoelectric figure of merit of the
Rb2NaIrF6 compound is 0.81 at 1000 K, suggesting high thermoelectric efficiency.
These findings demonstrate the potential of Rb2NaIrF6 lead-free double perovskite
compound for optoelectronic and thermoelectric applications. Therefore, our
investigation offers theoretical insights that can lead to the experimental synthesis and
study of Rb2NaIrF6 lead-free double perovskites.
Description
This article was published by Elsevier B.V in 2025