Identification of the symmetry of phonon modes in CsPbCl3 in phase IV by Raman and resonance-Raman scattering

Calistru, Dana M.; Mihuţ, L.; Lefrant, S.; Baltog, I.

doi:10.1063/1.366307

Cited by 121 publications

(116 citation statements)

References 14 publications

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“…6) in the whole range of the excitation intensity, is close the phonon energy of 25 meV reported in Ref. 11, where twelve Raman active phonons were resolved at 77 K for bulk single crystals of CsPbCl 3 . In the abovementioned luminescence spectra of bulk CsPbCl 3 crystals, the same phonon (of 25 meV energy) is related to the E 2 band.…”

Section: Discussionsupporting

confidence: 88%

Photoluminescence and stimulated emission from microcrystallineCsPbCl3films prepared by amorphous-to-crystalline transformation

et al. 2004

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Highly excited photoluminescence of CsPbCl 3 , which is known to be one of the most photoluminescent semiconductors, has been measured for thin films prepared by crystallization from the amorphous phase into microcrystalline/polycrystalline states. With the increase of excitation intensity, the microcrystalline state shows successive jumps of the dominant emission band, from a free-exciton band to its phonon replica and finally to a lowest-energy band originating from exciton-exciton inelastic collision. For the exciton-exciton porcess stimulated emission occurs at very low threshold excitation intensities of the order of 10 kW/ cm 2 at 77 K. At higher excitation intensities above 50 kW/ cm 2 , single-path-light-amplification stimulated emission across the film thickness is observed suggesting a very large optical gain. The large-gain mechanism is attributable to giant oscillator strength effect characteristic of excitonic superradiance recently reported for films prepared in the same way.

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Section: Discussionsupporting

confidence: 88%

Photoluminescence and stimulated emission from microcrystallineCsPbCl3films prepared by amorphous-to-crystalline transformation

et al. 2004

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“…[10] TheR aman spectra for CsPbBr 3 ,F LBP,a nd the nanocomposite are shown in Figure 2e.T he Raman spectrum of pure FLBP shows aclear signature at about 359 cm À1 (out-ofplane phonon mode,A 1 g ), 435.9 cm À1 (in-plane mode,B 2g ), and 463.9 cm À1 (in-plane mode,A 2 g ), as expected, [8b] while for the pure CsPbBr 3 QDs,R aman features were observed at 77.3 cm À1 (vibrational mode of PbBr 6 octahedra) and 108.4 cm À1 (attributed to the motion of Cs + ions with respect to PbBr 6 octahedra). [11] Clear signatures of CsPbBr 3 , [12] along with those for FLBP,w ere noted in the nanocomposite spectrum. Interestingly,t he 108.4 cm À1 mode is enhanced in the case of the nanocomposite sample as compared to the pure CsPbBr 3 QDs,and there is also ared-shift of the Raman peaks of FLBP in the case of the nanocomposite (Figure 2f).…”

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confidence: 88%

Photoluminescence Quenching in Self‐Assembled CsPbBr₃ Quantum Dots on Few‐Layer Black Phosphorus Sheets

et al. 2018

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“…[21,22] However, tetragonal and orthorhombic CsPbCl3 become Raman active. [19,20] A subtle but important difference is expected between the inorganic and hybrid perovskite. The disorder will relax the Raman selection for the cubic-phase, i.e., the first order Raman will become partially allowed, but in the meantime result in spectral broadening, which will manifest as a disorder activated band reflecting the phonon density of states, as what was observed in a similar system MAPbCl3 for its room temperature cubic phase.…”

Section: Introductionmentioning

confidence: 99%

Erratum: Multiple-Stage Structure Transformation of Organic-Inorganic Hybrid Perovskite CH3NH3PbI3 [Phys. Rev. X

Chen¹,

Liu²,

Kim³

et al. 2017

Phys. Rev. X

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By performing spatially resolved Raman and photoluminescence spectroscopy with varying excitation wavelength, density, and data acquisition parameters, we have achieved a unified understanding towards the spectroscopy signatures of the organic-inorganic hybrid perovskite, transforming from the pristine state (CH3NH3PbI3) to fully degraded state (i.e., PbI2) for samples with varying crystalline domain size from mesoscopic scale (approximately 100 nm) to macroscopic size (cm), synthesized by three different techniques. We show that the hybrid perovskite exhibits multiple stages of structure transformation occurring either spontaneously or under light illumination, with exceptionally high sensitivity to the illumination conditions (e.g., power, illumination time and interruption pattern). We highlight four transformation stages (Stage I -IV, with Stage I being the pristine state) along a primary structure degradation path exhibiting distinctly different Raman spectroscopy features at each stage, and point out that previously reported Raman spectra in the literature reflect degraded structures of either Stage III or IV.Additional characteristic optical features of partially degraded materials under the joint action of spontaneous and photo degradation are given. This study offers reliable benchmark results for understanding the intrinsic material properties and structure transformation of this unique category of hybrid materials, and a straightforward method to monitor the structure degradation after the material is used in a device or characterized by other techniques. The findings are pertinently important to a wide range of potential applications where the hybrid material is expected to function in greatly different environment and light-matter interaction conditions.

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Identification of the symmetry of phonon modes in CsPbCl3 in phase IV by Raman and resonance-Raman scattering

Cited by 121 publications

References 14 publications

Photoluminescence and stimulated emission from microcrystallineCsPbCl3films prepared by amorphous-to-crystalline transformation

Photoluminescence and stimulated emission from microcrystallineCsPbCl3films prepared by amorphous-to-crystalline transformation

Photoluminescence Quenching in Self‐Assembled CsPbBr₃ Quantum Dots on Few‐Layer Black Phosphorus Sheets

Erratum: Multiple-Stage Structure Transformation of Organic-Inorganic Hybrid Perovskite CH3NH3PbI3 [Phys. Rev. X

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Identification of the symmetry of phonon modes in CsPbCl3 in phase IV by Raman and resonance-Raman scattering

Cited by 121 publications

References 14 publications

Photoluminescence and stimulated emission from microcrystallineCsPbCl3films prepared by amorphous-to-crystalline transformation

Photoluminescence and stimulated emission from microcrystallineCsPbCl3films prepared by amorphous-to-crystalline transformation

Photoluminescence Quenching in Self‐Assembled CsPbBr3 Quantum Dots on Few‐Layer Black Phosphorus Sheets

Erratum: Multiple-Stage Structure Transformation of Organic-Inorganic Hybrid Perovskite CH3NH3PbI3 [Phys. Rev. X

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Photoluminescence Quenching in Self‐Assembled CsPbBr₃ Quantum Dots on Few‐Layer Black Phosphorus Sheets