Effect of halide-mixing on tolerance factor and charge-carrier dynamics in (CH3NH3PbBr3−xClx) perovskites powders

Siddique, Zumaira; Payne, Julia L.; Irvine, John T. S.; Jagadamma, Lethy Krishnan; Akhter, Zareen; Samuel, Ifor D. W.; Iqbal, Azhar

doi:10.1007/s10854-020-04475-4

Cited by 7 publications

(4 citation statements)

References 68 publications

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“…The obtained diffraction peaks are ascribed to the characteristic peaks of the tetragonal perovskite crystal system (space group: I 4/ mcm ). 25,26 This confirms that all the films prepared with the varied ratios of Mg : Pb crystallize in the perovskite structure. This also ascertains that incorporation of the Mg 2+ cation in the pristine MAPbX 3 perovskite does not significantly alter or distort the inherent perovskite structure, despite the significant difference in the ionic radii of Pb 2+ and Mg 2+ .…”

Section: Resultssupporting

confidence: 71%

Fabrication of a self-powered broadband photodetector by 50% replacement of Pb by Mg in the CH₃NH₃Pb_0.5Mg_0.5Cl₂I perovskite lattice

B.,

Panda,

Ramasamy

et al. 2023

Mater. Adv.

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Section: Resultssupporting

confidence: 71%

Fabrication of a self-powered broadband photodetector by 50% replacement of Pb by Mg in the CH₃NH₃Pb_0.5Mg_0.5Cl₂I perovskite lattice

B.,

Panda,

Ramasamy

et al. 2023

Mater. Adv.

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“…Differently reported for simple perovskites (ABX 3 ) where the Goldschmidt’s tolerance factor t = ( r A + r X )/√2( r B + r X ), for double halide perovskites, the r B was obtained as the average value between r Sb 3+ and r Ag + . In mixed-anion perovskites, the parameter r X can be further described using the anionic effective radius (denoted here as r effective ) which is equal to (1 – δ) r Cl – + δ r Br – , as reported by Siddique et al to analyze the stability of mixed CH 3 NH 3 PbBr 3‑ δ Cl δ perovskites. These modifications were also inserted into the calculations of the u and t ′ factors.…”

Section: Resultsmentioning

confidence: 99%

Exploring the Halide Exchange Engineering on Lead-free Cs₂AgSbCl_6−δBr_δ Mixed-Halide Double Perovskite: A DFT Study

Laranjeira,

Azevedo,

La Porta

et al. 2024

J. Phys. Chem. C

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Halide perovskites, commonly studied in optoelectronics, have an ABX 3 structure, where A + is a monovalent cation, B 2+ is a divalent cation, and X − is a halide ion. The use of the Pb 2+ ion in the B site has generated some concern regarding its toxicity in a possible large-scale application. To address this, replacing Pb 2+ with heterovalent elements is explored to obtain double halide perovskites, denoted as A 2 B′B″X 6 , where B′ and B″ are trivalent and monovalent cations, respectively. Anion exchange reactions can tailor the optical and electronic properties of these structures by band gap energy control. This study seeks to reveal the strong correlation between the structure composition of Cs2AgSbCl 6−δ Br δ mixed-halide double perovskites by means of computational simulations. These structures consist of three-dimensional (3D) lattices of [SbCl 6−δ Br δ ] and [AgCl 6−δ Br δ ] distorted octahedral clusters. For different δ values, the compounds exhibit different space groups: I4mm (C 4v ) for δ = 2 and 4, remaining I4mm (C 4v ) for δ = 1 and 5, and showing R3m (C 3v ) symmetry for δ = 3. Incorporating Br − significantly reduces structural organization in short and long ranges. All Cs 2 AgSbCl 6−δ Br δ compounds exhibit indirect band gap energy at the X → L point, reducing from 2.72 to 1.77 eV with the increased Br content.

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“…The SSPL and TRPL analysis were conducted by Pico Quant Fluo Time 300 (FT-300) spectrophotometer as described in our previous work [39][40][41]. Brie y, the SSPL spectrum was measured following excitation at 306 nm with a pulsed LED excitation (PLS-300) source.…”

Section: Characterization Methodsmentioning

confidence: 99%

Elucidating the Photoluminescence Quenching in Ensulizole: an Artificial Water Soluble Sunscreen

et al. 2021

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Employing natural or arti cial sunscreens is essential to protect the skin from ultraviolet radiations that cause premature aging and develop melanoma and other forms of skin cancer. The 2-Phenylbenzimidazole-5-sulfonic acid, commonly known as ensulizole is a water-soluble arti cial sunscreen that absorbs mostly UV-B (280 nm − 315 nm) radiations and protects the skin against the harmful effects of these radiations. Steady-state absorption indicates a strong absorption feature at 303 nm and a weak at 316 nm that have been identi ed as π → π* and n → π* transitions, respectively. The photoluminescence (PL) spectra indicate that the PL of ensulizole is less Stokes-shifted in polar solvents and more Stokes-shifted in non-polar solvents. The average PL lifetime of ensulizole is longer in non-polar solvents as compared to polar solvents and it exhibits the shortest PL lifetime in aqueous medium that signi es its e ciency in water. This suggests in non-polar solvents intersystem crossing is the dominant mode of relaxation of the excited ππ* state. Furthermore, an increase of pH of ensulizole solution decreases the PL intensity and the lifetime.Stern-Volmer equation is employed to evaluate bimolecular quenching rate constant k q that suggests the diffusional dynamic mode of PL quenching is operative.

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Effect of halide-mixing on tolerance factor and charge-carrier dynamics in (CH3NH3PbBr3−xClx) perovskites powders

Cited by 7 publications

References 68 publications

Fabrication of a self-powered broadband photodetector by 50% replacement of Pb by Mg in the CH₃NH₃Pb_0.5Mg_0.5Cl₂I perovskite lattice

Fabrication of a self-powered broadband photodetector by 50% replacement of Pb by Mg in the CH₃NH₃Pb_0.5Mg_0.5Cl₂I perovskite lattice

Exploring the Halide Exchange Engineering on Lead-free Cs₂AgSbCl_6−δBr_δ Mixed-Halide Double Perovskite: A DFT Study

Elucidating the Photoluminescence Quenching in Ensulizole: an Artificial Water Soluble Sunscreen

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Effect of halide-mixing on tolerance factor and charge-carrier dynamics in (CH3NH3PbBr3−xClx) perovskites powders

Cited by 7 publications

References 68 publications

Fabrication of a self-powered broadband photodetector by 50% replacement of Pb by Mg in the CH3NH3Pb0.5Mg0.5Cl2I perovskite lattice

Fabrication of a self-powered broadband photodetector by 50% replacement of Pb by Mg in the CH3NH3Pb0.5Mg0.5Cl2I perovskite lattice

Exploring the Halide Exchange Engineering on Lead-free Cs2AgSbCl6−δBrδ Mixed-Halide Double Perovskite: A DFT Study

Elucidating the Photoluminescence Quenching in Ensulizole: an Artificial Water Soluble Sunscreen

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Product

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Fabrication of a self-powered broadband photodetector by 50% replacement of Pb by Mg in the CH₃NH₃Pb_0.5Mg_0.5Cl₂I perovskite lattice

Fabrication of a self-powered broadband photodetector by 50% replacement of Pb by Mg in the CH₃NH₃Pb_0.5Mg_0.5Cl₂I perovskite lattice

Exploring the Halide Exchange Engineering on Lead-free Cs₂AgSbCl_6−δBr_δ Mixed-Halide Double Perovskite: A DFT Study