All-Inorganic CsPbBr3 Perovskite Films Prepared by Single Source Thermal Ablation

Nasi, L.; Calestani, Davide; Mezzadri, Francesco; Mariano, Fabrizio; Listorti, Andrea; Ferro, Patrizia; Mazzeo, Marco; Mosca, R.

doi:10.3389/fchem.2020.00313

Cited by 34 publications

(24 citation statements)

References 50 publications

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“…Electron energy-loss spectroscopy (EELS) reported the onset optical gap of around 2.4–2.5 eV for a 10 nm thick thin film of CsPbBr 59 . The thin film of CsPbBr perovskite prepared from Single Source Thermal Ablation shows absorption onset at 530 nm 78 . Also, the CsPbBr film prepared by 2-step sequential deposition, exhibit prominent absorbance peaks at 510–525 nm, with absorbance onset at 532 nm 79 .…”

Section: Resultsmentioning

confidence: 99%

Electronic and optical properties of bulk and surface of CsPbBr3 inorganic halide perovskite a first principles DFT 1/2 approach

Ezzeldien

Al‐Qaisi

Alrowaili

et al. 2021

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This work aims to test the effectiveness of newly developed DFT-1/2 functional in calculating the electronic and optical properties of inorganic lead halide perovskites CsPbBr3. Herein, from DFT-1/2 we have obtained the direct band gap of 2.36 eV and 3.82 eV for orthorhombic bulk and 001-surface, respectively. The calculated energy band gap is in qualitative agreement with the experimental findings. The bandgap of ultra-thin film of CsPbBr3 is found to be 3.82 eV, which is more than the expected range 1.23-3.10 eV. However, we have found that the bandgap can be reduced by increasing the surface thickness. Thus, the system under investigation looks promising for optoelectronic and photocatalysis applications, due to the bandgap matching and high optical absorption in UV–Vis (Ultra violet and visible spectrum) range of electro-magnetic(em) radiation.

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Section: Resultsmentioning

confidence: 99%

Electronic and optical properties of bulk and surface of CsPbBr3 inorganic halide perovskite a first principles DFT 1/2 approach

Ezzeldien

Al‐Qaisi

Alrowaili

et al. 2021

Sci Rep

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“…Additionally, pressure-assisted high-temperature sequential thermal evaporation growth and/or a post-growth annealing treatment can be necessary, due to CsBr precursors poorly reacting properly with PbBr 2 salt because of their hard diffusion in the growing film [50]. Recently, single source thermal evaporation of CsPbBr 3 precursor material, prepared by a common solution-based multistep approach, was reported to yield films consisting of a mixture of CsPbBr 3 , CsPb 2 Br 5 and Cs 4 PbBr 6 compounds requiring mild post deposition treatments to obtain full conversion to CsPbBr 3 [51]. Therefore, post-deposition annealing of the CsPbBr 3 films deposited by thermal evaporation is a key post-growth step to improve quality and solar cell conversion efficiency [10,40,52].…”

Section: Introductionmentioning

confidence: 99%

Pulsed Laser Deposition of CsPbBr3 Films: Impact of the Composition of the Target and Mass Distribution in the Plasma Plume

et al. 2021

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All-inorganic cesium lead bromine (CsPbBr3) perovskites have gained a tremendous potential in optoelectronics due to interesting photophysical properties and much better stability than the hybrid counterparts. Although pulsed laser deposition (PLD) is a promising alternative to solvent-based and/or thermal deposition approaches due to its versatility in depositing multi-elemental materials, deep understanding of the implications of both target composition and PLD mechanisms on the properties of CsPbBr3 films is still missing. In this paper, we deal with thermally assisted preparation of mechano-chemically synthesized CsPbBr3 ablation targets to grow CsPbBr3 films by PLD at the fluence 2 J/cm2. We study both Cs rich- and stoichiometric PbBr2-CsBr mixture-based ablation targets and point out compositional deviations of the associated films resulting from the mass distribution of the PLD-generated plasma plume. Contrary to the conventional meaning that PLD guarantees congruent elemental transfer from the target to the substrate, our study demonstrates cation off-stoichiometry of PLD-grown CsPbBr3 films depending on composition and thermal treatment of the ablation target. The implications of the observed enrichment in the heavier element (Pb) and deficiency in the lighter element (Br) of the PLD-grown films are discussed in terms of optical response and with the perspective of providing operative guidelines and future PLD-deposition strategies of inorganic perovskites.

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“…In order to analyze the crystallization properties of perovskite films with different molar ratios of PbBr 2 and CsBr, XRD measurements were further carried out. As shown in Figure 2, all the XRD patterns show diffraction peaks at 15.09 °, 21.36 °, and 30.52 °, which can be assigned to (100), (101), and (200) facets of the typical three-dimensional CsPbBr 3 perovskite structure in the cubic phase, respectively (Akkerman et al, 2017;Nasi et al, 2020). Obviously, with the increase of CsBr ratios, the XRD peaks corresponding to CsPbBr 3 weaken, indicating smaller grain size in the films, which is consistent with the SEM results (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

Hole Transport Layer Free Perovskite Light-Emitting Diodes With High-Brightness and Air-Stability Based on Solution-Processed CsPbBr3-Cs4PbBr6 Composites Films

et al. 2022

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Recently, perovskite light-emitting diodes (PeLEDs) have drew widespread attention due to their high efficiencies. However, because of the sensitivity to moisture and oxygen, perovskite luminescent layers are usually prepared in high-purity nitrogen environment, which increases the cost and process complexity of device preparation and seriously hindrances its commercialization of PeLED in lighting and display application. Herein, dual-phase all-inorganic composite CsPbBr3-Cs4PbBr6 films are fabricated from CsBr-rich perovskite solutions by a simple one-step spin-coating method in the air with high humidity. Compared with the pure CsPbBr3 film, the composite CsPbBr3-Cs4PbBr6 film has much stronger photoluminescence emission and longer fluorescence lifetime, accompanied by increased photoluminescence quantum yield (33%). As a result, we obtained green PeLED devices without hole transport layer exhibiting a maximum brightness of 72,082 cd/m2 and a maximum external quantum efficiency of about 2.45%, respectively. More importantly, the champion device shows excellent stability with operational half-lifetime exceeding 1,000 min under continuous operation in the air. The dual-phase all-inorganic composite CsPbBr3-Cs4PbBr6 film shows attractive prospect for advanced light emission applications.

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All-Inorganic CsPbBr3 Perovskite Films Prepared by Single Source Thermal Ablation

Cited by 34 publications

References 50 publications

Electronic and optical properties of bulk and surface of CsPbBr3 inorganic halide perovskite a first principles DFT 1/2 approach

Electronic and optical properties of bulk and surface of CsPbBr3 inorganic halide perovskite a first principles DFT 1/2 approach

Pulsed Laser Deposition of CsPbBr3 Films: Impact of the Composition of the Target and Mass Distribution in the Plasma Plume

Hole Transport Layer Free Perovskite Light-Emitting Diodes With High-Brightness and Air-Stability Based on Solution-Processed CsPbBr3-Cs4PbBr6 Composites Films

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