Composition-Dependent Degradation of Hybrid and Inorganic Lead Perovskites in Ambient Conditions

Calisi, Nicola; Caporali, Stefano; Milanesi, Alessio; Innocenti, Massimo; Salvietti, Emanuele; Bardi, Ugo

doi:10.1007/s11244-018-0922-5

Cited by 23 publications

(22 citation statements)

References 34 publications

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“…This instability makes them unsuitable for application where a long lifetime is crucial. To overcome this issue, fully inorganic perovskites, which present comparable optoelectronics properties to the hybrid ones, were realized by the substitution of the organic cation by an inorganic one [12]. Solution-based chemical synthesis represents the most common route used for deposition of thin and thick layers and, among them, spin-coating and dipping techniques are the most widely used [5].…”

Section: Introductionmentioning

confidence: 99%

First Proof-of-Principle of Inorganic Lead Halide Perovskites Deposition by Magnetron-Sputtering

et al. 2019

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The present work reports the application of RF-magnetron sputtering technique to realize CsPbBr 3 70 nm thick films on glass substrate by means of a one-step procedure. The obtained films show highly uniform surface morphology and homogeneous thickness as evidenced by AFM and SEM investigations. XRD measurements demonstrate the presence of two phases: a dominant orthorhombic CsPbBr 3 and a subordinate CsPb 2 Br 5 . Finally, XPS data reveals surface bromine depletion respect to the stoichiometrical CsPbBr 3 composition, nevertheless photoluminescence spectroscopy results confirm the formation of a highly luminescent film. These preliminary results demonstrate that our approach could be of great relevance for easy fabrication of large area perovskite thin films. Future developments, based on this approach, may include the realization of multijunction solar cells and multicolor light emitting devices.

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Section: Introductionmentioning

confidence: 99%

First Proof-of-Principle of Inorganic Lead Halide Perovskites Deposition by Magnetron-Sputtering

et al. 2019

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“…In this Letter we report on experimental evidence of polaron formation by measuring its fingerprint in the electronic structure. We concentrate on the prototypical inorganic LHP CsPbBr 3 , which has lately attracted interest for applications, due to better thermal and radiation stability compared to hybrid organic-inorganic LHPs [21][22][23][24][25]. The momentum-resolved electronic structure of CsPbBr 3 is determined by angle-resolved photoelectron spectroscopy (ARPES) and compared with ab initio density functional theory (DFT).…”

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confidence: 99%

Evidence of Large Polarons in Photoemission Band Mapping of the Perovskite Semiconductor CsPbBr3

et al. 2020

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Lead-halide perovskite (LHP) semiconductors are emergent optoelectronic materials with outstanding transport properties which are not yet fully understood. We find signatures of large polaron formation in the electronic structure of the inorganic LHP CsPbBr 3 by means of angle-resolved photoelectron spectroscopy. The experimental valence band dispersion shows a hole effective mass of 0.26 AE 0.02 m e , 50% heavier than the bare mass m 0 ¼ 0.17 m e predicted by density functional theory. Calculations of the electron-phonon coupling indicate that phonon dressing of the carriers mainly occurs via distortions of the Pb-Br bond with a Fröhlich coupling parameter α ¼ 1.81. A good agreement with our experimental data is obtained within the Feynman polaron model, validating a viable theoretical method to predict the carrier effective mass of LHPs ab initio.

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“…The XRD/XPS analysis evidenced the good quality of the film with no residual solvents and contaminants. The film was then covered with Poly(methyl methacrylate) (PMMA) to prevent deterioration due to air and water vapor [14]. A PMMA solution was obtained by dissolving the polymer in dichloromethane.…”

Section: Methodsmentioning

confidence: 99%

Electrically Active Defects in Polycrystalline and Single Crystal Metal Halide Perovskite

et al. 2020

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We studied electrically active defects in CsPbBr3 polycrystalline films and single crystals samples using the thermally stimulated currents (TSC) technique in the temperature range 100–400 K. Below room temperature, both polycrystalline and single-crystals TSC emission is composed by a quasi-continuum of energy levels in the range 0.1–0.3 eV, and capture cross sections ~10−21 cm2. Above room temperature, TSC analysis reveals the presence of defect states in the range 0.40–0.52 eV only in polycrystalline samples, whereas these intermediate energy states are absent in TSC detected in single crystals. In polycrystalline films, the occupancy changes of an energy level at 0.45 eV strongly influences the room temperature photoconductivity, giving rise to slow transients due to defect passivation. In single-crystals, where intermediate energy states are absent, the photoconductivity response during illumination is almost stable and characterized by fast rise/decay times, a promising result for future applications of this material in photodetection and dosimetry.

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Composition-Dependent Degradation of Hybrid and Inorganic Lead Perovskites in Ambient Conditions

Cited by 23 publications

References 34 publications

First Proof-of-Principle of Inorganic Lead Halide Perovskites Deposition by Magnetron-Sputtering

First Proof-of-Principle of Inorganic Lead Halide Perovskites Deposition by Magnetron-Sputtering

Evidence of Large Polarons in Photoemission Band Mapping of the Perovskite Semiconductor CsPbBr3

Electrically Active Defects in Polycrystalline and Single Crystal Metal Halide Perovskite

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