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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Alam, Aftab
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Publications (9/9 displayed)
- 2024Biphenylene Nanoribbon as Promising Electrocatalyst for Hydrogen Evolution
- 2023Time-frequency analysis of radon and thoron data using continuous wavelet transformcitations
- 2023Anion/cation substitution in lead-free double-perovskite films: for band-gap optimization
- 2023Unconventional electronic phase transition in SnBi$_2$Te$_4$: role of anomalous thermal expansioncitations
- 2022Disorder-mediated quenching of magnetization in NbVTiAl:Theory and experimentcitations
- 2021Bipolar magnetic semiconducting behavior in VNbRuAlcitations
- 2021Novel Two-Dimensional MA 2 N 4 Materials for Photovoltaic and Spintronic Applicationscitations
- 2020Symmetry protection and giant Fermi arcs from multifold fermions in binary, ternary, and quaternary compoundscitations
- 2020Low-potential immunosensor-based detection of the vascular growth factor 165 (VEGF165) using the nanocomposite platform of cobalt metal–organic frameworkcitations
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article
Anion/cation substitution in lead-free double-perovskite films: for band-gap optimization
Abstract
<jats:p> During the past few years, halide double perovskites have been extensively explored for designing eco-friendly and stable perovskite-family absorber materials. In this work, thin films of Cs<jats:sub>2</jats:sub>AgBiBr<jats:sub>6</jats:sub> double perovskites were successfully fabricated with the aim of obtaining a lead-free system. Optical studies confirmed the large band gap of 2.33 eV of Cs<jats:sub>2</jats:sub>AgBiBr<jats:sub>6</jats:sub> films. Post-synthetic vapor treatment of Cs<jats:sub>2</jats:sub>AgBiBr<jats:sub>6</jats:sub> thin films, with tin (IV) iodide (SnI<jats:sub>4</jats:sub>; SI), was performed to engineer their optical response. Structural and optical studies confirmed the phase purity of the various SI-treated films. X-ray diffraction studies further showed a systematic shift toward lower 2θ values, which signified the expansion of lattice parameters on SI substitution in the Cs<jats:sub>2</jats:sub>AgBiBr<jats:sub>6</jats:sub> structure. The as-prepared pristine and SI-treated films showed good coverage with a reasonably large grain size. Furthermore, the optical studies revealed a 0.47 eV reduction in the band gap of SI-treated films, as opposed to a small band-gap change of approximately 0.22 eV when the pristine Cs<jats:sub>2</jats:sub>AgBiBr<jats:sub>6</jats:sub> film was treated with cesium iodide (CsI). This showed the role of the combined effects of charge-balancing defects and compositional substitution in band-gap lowering in Cs<jats:sub>2</jats:sub>AgBiBr<jats:sub>6</jats:sub>. The controlled doping in lead-free double perovskites for improved optical properties might help in strengthening their use for future optoelectronic applications. </jats:p>