Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs<sub>2</sub>AgBiBr<sub>6</sub>

Zelewski, Szymon J.; Urban, Joanna; Surrente, Alessandro; Maude, D. K.; Kuc, Agnieszka; Schade, Laura; Johnson, Roger A.; Dollmann, Markus; Nayak, Pabitra K.; Snaith, Henry J.; Radaelli, P. G.; Kudrawiec, R.; Nicholas, R. J.; Płochocka, Paulina; Baranowski, Michał

doi:10.1039/c9tc02402f

Cited by 185 publications

(248 citation statements)

References 52 publications

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“… 84 Cs 2 AgBiCl 6 has a pronounced long-lived component, previously attributed to the intrinsic PL lifetime driven by self-trapped excitons in this class of compounds ( Figure 7 a). 17 , 85 …”

Section: Resultsmentioning

confidence: 99%

Halide Mixing and Phase Segregation in Cs₂AgBiX₆ (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy

et al. 2020

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All-inorganic double perovskites (elpasolites) are a promising potential alternatives to lead halide perovskites in optoelectronic applications. Although halide mixing is a well-established strategy for band gap tuning, little is known about halide mixing and phase segregation phenomena in double perovskites. Here, we synthesize a wide range of single- and mixed-halide Cs 2 AgBiX 6 (X = Cl, Br, and I) double perovskites using mechanosynthesis and probe their atomic-level microstructure using 133 Cs solid-state MAS NMR. We show that mixed Cl/Br materials form pure phases for any Cl/Br ratio while Cl/I and Br/I mixing is only possible within a narrow range of halide ratios (<3 mol % I) and leads to a complex mixture of products for higher ratios. We characterize the optical properties of the resulting materials and show that halide mixing does not lead to an appreciable tunability of the PL emission. We find that iodide incorporation is particularly pernicious in that it quenches the PL emission intensity and radiative charge carrier lifetimes for iodide ratios as low as 0.3 mol %. Our study shows that solid-state NMR, in conjunction with optical spectroscopies, provides a comprehensive understanding of the structure–activity relationships, halide mixing, and phase segregation phenomena in Cs 2 AgBiX 6 (X = Cl, Br, and I) double perovskites.

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Section: Resultsmentioning

confidence: 99%

Halide Mixing and Phase Segregation in Cs₂AgBiX₆ (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy

et al. 2020

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“…Previous work attributed the sharp absorption peak in Cs 2 AgBiBr 6 to an exciton associated with the direct transition. 26,[52][53][54][55] However, there is also the possibility that these features in the pure compounds and mixed alloys are due to a narrow density of states at the band-edges. To explore this possibility, we computed the absorption spectra for Cs 2 AgSbBr 6 and Cs 2 AgBiBr 6 without excitonic effects (Fig.…”

Section: Electronic Structure and Bandgap Lowering Mechanismmentioning

confidence: 99%

Bandgap lowering in mixed alloys of Cs₂Ag(Sb_xBi_1−x)Br₆ double perovskite thin films

et al. 2020

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“…[ 109 ] A recent study by Zelewski et al revealed that PL in this material occurs via color centers rather than a band‐to‐band transition. [ 110 ] The composition dicesium silver bismuth hexachloride (Cs 2 AgBiCl 6 ) has also been realized, exhibiting a larger bandgap in the range of 2.3–2.5 eV and a broad PL emission centered at ≈550 nm. [ 111 ] While dicesium silver bismuth hexaiodide (Cs 2 AgBiI 6 ) has not been realized in this bulk form, it has been recently demonstrated that Cs 2 AgBiI 6 nanocrystals can be synthesized either by anion exchange from Cs 2 AgBiBr 6 nanocrystals [ 112 ] or directly by the choice of appropriate precursors.…”

Section: Composition Defects and Microstructure And Their Impact Onmentioning

confidence: 99%

Shining Light on the Photoluminescence Properties of Metal Halide Perovskites

Goetz

Taylor

Paulus

et al. 2020

Adv Funct Materials

122

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Lead halide perovskites are a remarkable class of materials that have emerged over the past decade as being suitable for application in a broad range of devices, such as solar cells, light‐emitting diodes, lasers, transistors, and memory devices. While they are often solution‐processed semiconductors deposited at low temperatures, perovskites exhibit properties one would only expect from highly pure inorganic crystals that are grown at high temperatures. This unique phenomenon has resulted in fast‐paced progress toward record device performance. Unfortunately, the basic science behind the remarkable nature of these materials is still not well understood. This review assesses the current understanding of the photoluminescence properties of metal halide perovskite materials and highlights key areas that require further research. Furthermore, the need to standardize the methods for characterization of PL in order to improve comparability, reliability, and reproducibility of results is emphasized.

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Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs₂AgBiBr₆

Abstract: The emission and absorption of Cs2AgBiBr6 are dominated by the strong carriers–phonon coupling.

Cited by 185 publications

References 52 publications

Halide Mixing and Phase Segregation in Cs₂AgBiX₆ (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy

Halide Mixing and Phase Segregation in Cs₂AgBiX₆ (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy

Bandgap lowering in mixed alloys of Cs₂Ag(Sb_xBi_1−x)Br₆ double perovskite thin films

Shining Light on the Photoluminescence Properties of Metal Halide Perovskites

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Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs2AgBiBr6

Abstract: The emission and absorption of Cs2AgBiBr6 are dominated by the strong carriers–phonon coupling.

Cited by 185 publications

References 52 publications

Halide Mixing and Phase Segregation in Cs2AgBiX6 (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy

Halide Mixing and Phase Segregation in Cs2AgBiX6 (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy

Bandgap lowering in mixed alloys of Cs2Ag(SbxBi1−x)Br6 double perovskite thin films

Shining Light on the Photoluminescence Properties of Metal Halide Perovskites

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Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs₂AgBiBr₆

Halide Mixing and Phase Segregation in Cs₂AgBiX₆ (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy

Halide Mixing and Phase Segregation in Cs₂AgBiX₆ (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy

Bandgap lowering in mixed alloys of Cs₂Ag(Sb_xBi_1−x)Br₆ double perovskite thin films