Strong electron–phonon coupling in vacancy-ordered Cs<sub>2</sub>SnBr<sub>6</sub> double perovskite

Soares, C. C. S.; Rodríguez-Hernández, J. S.; Gómez, Mayra. A. P.; Andrade, Davino M.; Fechine, Pierre B. A.; Ayala, A. P.; Paschoal, C. W. A.

doi:10.1039/d4tc01818d

J. Mater. Chem. C

2024

DOI: 10.1039/d4tc01818d

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Strong electron–phonon coupling in vacancy-ordered Cs₂SnBr₆ double perovskite

C. C. S. Soares,

J. S. Rodríguez-Hernández,

Mayra. A. P. Gómez

et al.

Abstract: This material exhibits high-order multiphonon scattering mediated by strong electron–phonon coupling. The broad luminescence and large Stokes shift suggest the presence of self-trapped excitons within the material.

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Structural and Electrical Characterization of Cs₂SnBr₆: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

Bouzidi,

Alatawi,

Jebnouni

et al. 2024

Applied Organom Chemis

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Lead‐free tin halide perovskites, particularly Cs2SnBr6, are gaining significant attention for their potential in optoelectronic applications. In this study, we investigate the material's electrical and vibrational properties under varying illumination conditions, providing novel insights into the impact of light on its conduction mechanisms. Cs2SnBr6 was synthesized via liquid‐phase and solid‐state reactions, and we report comprehensive analyses of its impedance, AC conductivity, and dielectric properties over a wide frequency range. Notably, our results reveal that light‐induced photogenerated charge carriers enhance conductivity, which is well explained by the overlapping large‐polaron tunneling (OLPT) model, while in darkness, the material follows the correlated barrier hopping (CBH) model. Moreover, Raman spectroscopy highlights structural changes, including a slight shortening of Sn–Br bond distances under illumination, which influences the vibrational frequencies and intensities. These findings emphasize the crucial role of illumination in tuning the electrical and dielectric responses of Cs2SnBr6, thus demonstrating its considerable promise for future optoelectronic applications, such as solar cells and photodetectors.

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Structural and Electrical Characterization of Cs₂SnBr₆: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

Bouzidi,

Alatawi,

Jebnouni

et al. 2024

Applied Organom Chemis

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Investigation on Structurally Engineered Cs₂AgInCl₆ via Alloying (Na⁺)/Doping (Cr³⁺, Mn²⁺) for Flexible Phosphor-Based White Light Devices and Latent Fingerprint Detection Application

Kanapathi,

Ravi,

Appadurai

2024

ACS Appl. Energy Mater.

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Recently, solid-state lighting (SSL) technology has been a major breakthrough in lighting systems, contributing notably to both economic and environmental sustainability. Halide double perovskite (HDP) based single component white light emitting semiconductors are currently a hot topic among researchers in the field of SSL technology, as they provide greater structural stability, flexibility, nontoxicity, etc. Herein, we chose Cs 2 AgInCl 6 (CAIC) from the HDP family as our white light emitter owing to its direct bandgap nature and ability to produce broad emission arising from the self-trapped excitons (STE) which are produced by the strong-electron phonon coupling. However, it suffers from low photoluminescence intensity due to its parity-forbidden transition arising from the same even-parity of valence band maximum (VBM) and conduction band minimum (CBM). Thus, Na alloying in Cs 2 AgInCl 6 has been implemented to break the parity via isolation of the [AgCl 6 ] 5− octahedron that restricts the contributions of the Ag-4d orbital in the VBM that induces the odd−even parity transition. To further enhance the luminescence properties of the material, the optimum composition Cs 2 Ag 0.4 Na 0.6 InCl 6 (A4N6) was chosen for transition ion doping (Mn 2+ and Cr 3+ ) to increase photoluminescence properties. Eventually, Cs 2 Ag 0.4 Na 0.6 InCl 6 :Mn6% (A4N6-Mn6) showed a photoluminescence intensity 30 times more than pristine CAIC with a photoluminescence quantum yield (PQLY) of 37.7%, CIE color coordinates (0.36, 0.44), and correlated color temperature of 4757 K. With best-performing materials, we have successfully fabricated a flexible phosphor-based white light-emitting device. It seems that this structural engineering led to the tuning of light from a cold white light region toward a warm white light region that can be efficiently used in household applications. Furthermore, Cs 2 Ag 0.4 Na 0.6 InCl 6 :Mn6% also exhibits the capability of visualizing latent fingerprint (LFP) detection, which will be used for forensic analysis in the future.

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Strong electron–phonon coupling in vacancy-ordered Cs₂SnBr₆ double perovskite

Abstract: This material exhibits high-order multiphonon scattering mediated by strong electron–phonon coupling. The broad luminescence and large Stokes shift suggest the presence of self-trapped excitons within the material.

Cited by 2 publications

References 93 publications

Structural and Electrical Characterization of Cs₂SnBr₆: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

Structural and Electrical Characterization of Cs₂SnBr₆: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

Investigation on Structurally Engineered Cs₂AgInCl₆ via Alloying (Na⁺)/Doping (Cr³⁺, Mn²⁺) for Flexible Phosphor-Based White Light Devices and Latent Fingerprint Detection Application

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Strong electron–phonon coupling in vacancy-ordered Cs2SnBr6 double perovskite

Abstract: This material exhibits high-order multiphonon scattering mediated by strong electron–phonon coupling. The broad luminescence and large Stokes shift suggest the presence of self-trapped excitons within the material.

Cited by 2 publications

References 93 publications

Structural and Electrical Characterization of Cs2SnBr6: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

Structural and Electrical Characterization of Cs2SnBr6: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

Investigation on Structurally Engineered Cs2AgInCl6 via Alloying (Na+)/Doping (Cr3+, Mn2+) for Flexible Phosphor-Based White Light Devices and Latent Fingerprint Detection Application

Contact Info

Product

Resources

About

Strong electron–phonon coupling in vacancy-ordered Cs₂SnBr₆ double perovskite

Structural and Electrical Characterization of Cs₂SnBr₆: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

Structural and Electrical Characterization of Cs₂SnBr₆: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

Investigation on Structurally Engineered Cs₂AgInCl₆ via Alloying (Na⁺)/Doping (Cr³⁺, Mn²⁺) for Flexible Phosphor-Based White Light Devices and Latent Fingerprint Detection Application