All‐Inorganic Perovskites: Aqueous Phase Exfoliating Quasi‐2D CsPbBr<sub>3</sub> Nanosheets with Ultrahigh Intrinsic Water Stability (Small 34/2019)

Lead halide perovskite (LHP) nanomaterials have attracted tremendous attention owing to their remarkable optoelectronic properties. However, they are extremely unstable under moist environments, high temperatures, and light illumination due to their intrinsic structural lability, which has been the critical unsolved problem for practical applications. To address this issue, we propose a facile and environmentally friendly ligand-free approach to design and synthesize rod-like CsPb 2 Br 5 -embedded Pb(OH)Br with excellent stability under various harsh environments such as soaking in water, heating, and ultraviolet (UV) illumination. Plate-like CsPbBr 3 -and Cs 4 PbBr 6 -embedded Pb(OH)Br powders are first formed by evaporating the solvent in a dispersion of ethanol (or methanol, isopropanol), Cs 2 CO 3 , and PbBr 2 . Upon soaking in water, the plate-like sample undergoes phase transformation from CsPbBr 3 and Cs 4 PbBr 6 to CsPb 2 Br 5 and shape conversion from nanoplate to a microrod, leading to the formation of rod-like CsPb 2 Br 5 -embedded Pb(OH)Br. The stable Pb(OH)Br coating effectively prevents the luminescent CsPb 2 Br 5 nanocrystals from reacting with water, leading to extremely high aqueous stability of the CsPb 2 Br 5 -embedded Pb(OH)Br. The photoluminescence (PL) intensity of the representative CsPb 2 Br 5 -embedded Pb(OH)Br sample can maintain 92.2% of the initial PL intensity value even after soaking in room-temperature water for 165 days; in the meantime, the phase and shape are preserved. The typical sample also shows outstanding stability under hot water, UV illumination, and annealing conditions. The ultrahigh aqueous stability, thermal stability, and photostability of the CsPb 2 Br 5 -embedded Pb(OH)Br nanomaterials suggest an effective, facile, and environmentally friendly technique to grow perovskite-based nanomaterials for promising practical applications in the optoelectronic field.

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Photodetectors with High Responsivity by Thickness Tunable Mixed Halide Perovskite Nanosheets

Mandal

Ghosh

et al. 2021

ACS Appl. Mater. Interfaces

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Chemical transformation of typically "nonlayered" phases into two-dimensional structures remains a formidable task. Among the thickness tunable CsPbX 3 (X = Br, Br/I, I) nanosheets (NSs), CsPbBr 1.5 I 1.5 NSs with a thickness of ∼4.9 nm have structural stability superior to ∼6.8 nm CsPbI 3 NSs and better hole mobility than ∼3.7 nm CsPbBr 3 NSs. Moving beyond the muchexplored CsPbBr 3 photodetectors, we demonstrate a sharp improvement of the photodetection of CsPbBr 1.5 I 1.5 NS devices by thickening the NSs to ∼6.1 nm through combining 8-carbon and 18-carbon ligand surfactants. Thereby, the responsivity increases up to one of the highest values of 3313 A W −1 at 1.5 V (and 3946 A W −1 at 2 V) with detectivity of 1.6 × 10 11 Jones at 1.5 V, due to the increase in carrier mobility up to 7.9 × 10 −4 cm 2 V −1 s −1 . The better device performance of the NSs than 8.6−13.9 nm nanocubes (NCs) is due to their planarity which facilitates in-plane mobilization of the charge carriers.

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All‐Inorganic Perovskites: Aqueous Phase Exfoliating Quasi‐2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability (Small 34/2019)

Cited by 4 publications

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Solvent-free blending of CsPbBr3 and commercial polymer: Interface-visualization, bandgap engineering and improved stability in 3D printing

Solvent-free blending of CsPbBr3 and commercial polymer: Interface-visualization, bandgap engineering and improved stability in 3D printing

Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability

Photodetectors with High Responsivity by Thickness Tunable Mixed Halide Perovskite Nanosheets

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All‐Inorganic Perovskites: Aqueous Phase Exfoliating Quasi‐2D CsPbBr3 Nanosheets with Ultrahigh Intrinsic Water Stability (Small 34/2019)

Cited by 4 publications

References 0 publications

Solvent-free blending of CsPbBr3 and commercial polymer: Interface-visualization, bandgap engineering and improved stability in 3D printing

Solvent-free blending of CsPbBr3 and commercial polymer: Interface-visualization, bandgap engineering and improved stability in 3D printing

Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability

Photodetectors with High Responsivity by Thickness Tunable Mixed Halide Perovskite Nanosheets

Contact Info

Product

Resources

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All‐Inorganic Perovskites: Aqueous Phase Exfoliating Quasi‐2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability (Small 34/2019)