Amorphous CsPbX3versus Crystalline Cs4PbX6(X=Br, Cl)–Their Localized Electronic States Studied by Optical Absorption Spectroscopy

Kondo, Shinichi; Amaya, K; Saito, T.

doi:10.1143/jpsj.70.3751

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…The consideration was recently confirmed by our subsequent measurement 7) of the fundamental absorption spectrum of (crystalline) Cs 4 PbBr 6 , whose crystal structure is composed of a hexagonal regular array of Pb 2þ (Br À ) 6 octahedra with the central Pb 2þ ions mutually isolated by intervening (between the octahedra) Cs þ ions, and whose low-energy absorption characteristics were very similar in feature to those of the amorphous CsPbBr 3 . Despite the close resemblance of the absorption properties between the amorphous CsPbBr 3 and crystalline Cs 4 PbBr 6 , however, they show quite different luminescence properties from each other.…”

Section: Resultsmentioning

confidence: 54%

Strongly Enhanced Free-Exciton Luminescence in Microcrystalline CsPbBr₃Films

et al. 2003

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The luminescence properties of CsPbBr 3 films prepared via the amorphous phase by crystallization are dominated by free-exciton emission, and only a weak trace of emission due to trapped excitons was observed, in contrast to the case of bulk CsPbBr 3 crystals. In particular, the films in the microcrystalline state show by more than an order of magnitude stronger free-exciton emission than in the polycrystalline state. The enhanced free-exciton emission is suggestive of excitonic superradiance.

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Section: Resultsmentioning

confidence: 54%

Strongly Enhanced Free-Exciton Luminescence in Microcrystalline CsPbBr₃Films

et al. 2003

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“…Recently, all-inorganic cesium lead halide perovskites without any organic components have emerged as promising candidates for absorbing layers in solar cells. − A CsPbX 3 perovskite, such as CsPbI 3 , exhibits better thermal stability than the OHP . The cubic-structured CsPbI 3 (α-CsPbI 3 phase) has an appropriate band gap (1.73 eV) for solar cell applications .…”

Section: Introductionmentioning

confidence: 99%

CsBr-Induced Stable CsPbI_3–xBr_x (x < 1) Perovskite Films at Low Temperature for Highly Efficient Planar Heterojunction Solar Cells

Zhou

et al. 2018

ACS Appl. Mater. Interfaces

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All-inorganic cesium lead perovskites have emerged as alternative absorbing layers in solar cells owing to their superb thermal stability compared with the organic−inorganic hybrid perovskites. However, the desired cubic CsPbI 3 phase forms at a high temperature and suffers from a phase transition to the orthorhombic yellow phase at room temperature. A developed nonstoichiometric method is applied to fabricate CsPbI 3−x Br x (x < 1) films by adding excess CsBr into the precursor solution. The excess CsBr in the precursor solution helps to produce a microstrain in the lattice to stabilize the cubic CsPbI 3 phase at low temperature and incorporate a small part of Br − into the CsPbI 3 lattice. At the optimal CsBr concentration (0.5 M), the corresponding solar cell achieves a power conversion efficiency of 10.92%. This work provides an effective way to stabilize the cubic CsPbI 3−x Br x (x < 1) phase at low temperature to further improve the performance of all-inorganic perovskite solar cells.

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“…The correlation between the PL and the absorption spectra indicates that only the CPB113 phase is responsible for the light emission around 520 nm, which originates from the excitonic recombination near the edges of the direct bandgap. ,, The CPB416 phase, alternatively, exhibits a bandgap at a UV wavelength (316 nm) and does not produce PL in the visible range (Figure S1). − For verification purposes, we deposited excessive CsBr precursor during the evaporation, which turns out necessary to eliminate trace amount of CPB113 . The thin film obtained in this manner (Sample F) exhibits the negligible PL intensity and the minimal absorbance in the visible range.…”

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Composite Perovskites of Cesium Lead Bromide for Optimized Photoluminescence

Ling

Tan

Wang

et al. 2017

J. Phys. Chem. Lett.

115

125

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The halide perovskite CsPbBr has shown its promise for green light-emitting diodes. The optimal conditions of photoluminescence and the underlying photophysics, however, remain controversial. To address the inconsistency seen in the previous reports and to offer high-quality luminescent materials that can be readily integrated into functional devices with layered architecture, we created thin films of CsPbBr/CsPbBr composites based on a dual-source vapor-deposition method. With the capability of tuning the material composition in a broad range, CsPbBr is identified as the only light emitter in the composites. Interestingly, the presence of the photoluminescence-inactive CsPbBr can significantly enhance the light emitting efficiency of the composites. The unique negative thermal quenching observed near the liquid nitrogen temperature indicates that a type of shallow state generated at the CsPbBr/CsPbBr interfaces is responsible for the enhancement of photoluminescence.

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Amorphous CsPbX₃versus Crystalline Cs₄PbX₆(X=Br, Cl)–Their Localized Electronic States Studied by Optical Absorption Spectroscopy

Cited by 10 publications

References 6 publications

Strongly Enhanced Free-Exciton Luminescence in Microcrystalline CsPbBr₃Films

Strongly Enhanced Free-Exciton Luminescence in Microcrystalline CsPbBr₃Films

CsBr-Induced Stable CsPbI_3–xBr_x (x < 1) Perovskite Films at Low Temperature for Highly Efficient Planar Heterojunction Solar Cells

Composite Perovskites of Cesium Lead Bromide for Optimized Photoluminescence

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Amorphous CsPbX3versus Crystalline Cs4PbX6(X=Br, Cl)–Their Localized Electronic States Studied by Optical Absorption Spectroscopy

Cited by 10 publications

References 6 publications

Strongly Enhanced Free-Exciton Luminescence in Microcrystalline CsPbBr3Films

Strongly Enhanced Free-Exciton Luminescence in Microcrystalline CsPbBr3Films

CsBr-Induced Stable CsPbI3–xBrx (x < 1) Perovskite Films at Low Temperature for Highly Efficient Planar Heterojunction Solar Cells

Composite Perovskites of Cesium Lead Bromide for Optimized Photoluminescence

Contact Info

Product

Resources

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Amorphous CsPbX₃versus Crystalline Cs₄PbX₆(X=Br, Cl)–Their Localized Electronic States Studied by Optical Absorption Spectroscopy

Strongly Enhanced Free-Exciton Luminescence in Microcrystalline CsPbBr₃Films

Strongly Enhanced Free-Exciton Luminescence in Microcrystalline CsPbBr₃Films

CsBr-Induced Stable CsPbI_3–xBr_x (x < 1) Perovskite Films at Low Temperature for Highly Efficient Planar Heterojunction Solar Cells