Halide-modulated self-assembly of metal-free perovskite single crystals for bio-friendly X-ray detection

Cui, Qingyue; Song, Xin; Liu, Yucheng; Xu, Zhuo; Ye, Haochen; Yang, Zhou; Zhao, Kui; Liu, Shengzhong

doi:10.1016/j.matt.2021.05.018

Cited by 55 publications

(105 citation statements)

References 72 publications

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“…Both of these values are much greater than for the standard lead halide perovskite materials, and this implies a much broader range of transparency for nonlinear optical applications in the visible and near-IR . Though density functional theory is poor at predicting band gap values, previous work, by Cui et al, has indicated that the valence band maximum mainly originates from the 5p orbital of I, while the conduction band minimum is dominated by the cation . In their work, the conduction band did not change significantly when the cation (DABCO) was used in conjunction with different halides, so it is likely that this slight difference in band gap is dominated by the change in cation.…”

Section: Resultsmentioning

confidence: 90%

Wide-Band-Gap Metal-Free Perovskite for Third-Order Nonlinear Optics

et al. 2021

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This paper establishes the potential of the recently introduced ABX3 metal-free perovskite structures for third-order nonlinear optical processes. The base unit in this family of materials is an ammonium halide octahedra, and it incorporates a large aromatic cation spacer forming the classic perovskite structure. This work shows that the choice of cation is key to the resulting third-order nonlinearity, where the incorporation of “MDABCO” into the structure, a very polar cation, results in a third-order nonlinear refractive index on the order of 10–17 m2 W–1 and high laser damage threshold of 0.8 J cm–2. Owing to its very wide band gap of ∼5.12 eV, this material exhibits a high nonlinear figure of merit across the visible and near-infrared transmission windows. These results show that the metal-free family of perovskite materials is an excellent candidate for nonlinear optics in the important visible and near-infrared wavelength regimes.

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Section: Resultsmentioning

confidence: 90%

Wide-Band-Gap Metal-Free Perovskite for Third-Order Nonlinear Optics

et al. 2021

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“…The initial decomposition temperature is defined as the heating temperature making mass loss of 1%. [ 38 ] The initial decomposition temperatures are 215 °C for (PEA) 2 PbI 4 PSC and 245 °C for (o‐F‐PEA) 2 PbI 4 PSC (Figure 3b). The fastest decomposition temperature of (o‐F‐PEA) 2 PbI 4 PSC increase to 330.3 °C (Figure 3c) which is higher than that of (PEA) 2 PbI 4 PSC (324.9 °C).…”

Section: Resultsmentioning

confidence: 99%

First‐Principles Calculation Design for 2D Perovskite to Suppress Ion Migration for High‐Performance X‐ray Detection

Zhang

et al. 2021

Adv Funct Materials

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Ion migration is a key root-cause of photocurrent instability in perovskite X-ray detectors. Although 2D perovskite single crystal (PSC) is a good candidate to suppress ion migration compared with its 3D counterpart, its intrinsic stability still needs to be improved. In this work, it is first envisioned to conquer the ion migration by enhanced chemical bonding; the proposal is further confirmed by density functional theory calculations, in which the bonds are made stronger by introducing a fluorine atom into the ortho position of phenethylamine (o-F-PEA) to shorten the distance between adjacent organic cations in the crystal lattice for enhanced electrostatic interactions between the F atom and the neighboring benzene ring. It is further demonstrated experimentally that the activation energy for ion migration (AEIM) of (o-F-PEA) 2 PbI 4 PSC is increased compared with that of (PEA) 2 PbI 4 PSC. The improved AEIM is also confirmed by enhanced thermal stability. Consequently, the dark current in the (o-F-PEA) 2 PbI 4 2D PSC X-ray detectors is reduced by two times compared with the (PEA) 2 PbI 4 reference. Furthermore, the detector shows the sensitivity of 1724.5 μC Gy air −1 cm −2 at 1250 V mm −1 , and much improved photocurrent stability.

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“…[38,39] The difference in N t density is probably caused by the different quality of crystallinity and improved strength of hydrogen bonds for stable crystal structure. [12] Also, the noise density spectra of three different kinds of devices were performed in Fig- ure S15. Obviously, the devices of Br-and I-based PAZE-NH 4 X 3 •H 2 O possess lower noise than the Cl-based one, which would be originated from the different ion diffusion energy with different halide as discussed above.…”

Section: Resultsmentioning

confidence: 99%

Metal‐Free PAZE‐NH₄X₃⋅H₂O Perovskite for Flexible Transparent X‐ray Detection and Imaging

Peng

Chen

et al. 2022

Angewandte Chemie

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Metal-free perovskites are of interest for their chemical diversity and eco-friendly properties, and recently have been used for X-ray detection with superior carrier behavior. However, the size and shape complexity of the organic components results in difficulties in evaluating their stability in high-energy radiation. Herein, we introduce multiple hydrogen-bond metalfree PAZE-NH 4 X 3 •H 2 O perovskite, where H 2 O leads to more hydrogen bonds appearing between organic molecules and the perovskite host. As suggested by the theoretical calculations, multiple hydrogen bonds promote stiffness of the lattice, and increase the diffusion barrier to inhibit ionic migration. Then, low trap density, high μτ products and structural flexibility of PAZE-NH 4 Br 3 •H 2 O give a flexible X-ray detector with the highest sensitivity of 3708 μC Gy air À 1 cm À 2 , ultra-low detection limit of 0.19 μGy air À 1 s À 1 and superior spatial resolution of 5.0 lp mm À 1 .

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Halide-modulated self-assembly of metal-free perovskite single crystals for bio-friendly X-ray detection

Cited by 55 publications

References 72 publications

Wide-Band-Gap Metal-Free Perovskite for Third-Order Nonlinear Optics

Wide-Band-Gap Metal-Free Perovskite for Third-Order Nonlinear Optics

First‐Principles Calculation Design for 2D Perovskite to Suppress Ion Migration for High‐Performance X‐ray Detection

Metal‐Free PAZE‐NH₄X₃⋅H₂O Perovskite for Flexible Transparent X‐ray Detection and Imaging

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Halide-modulated self-assembly of metal-free perovskite single crystals for bio-friendly X-ray detection

Cited by 55 publications

References 72 publications

Wide-Band-Gap Metal-Free Perovskite for Third-Order Nonlinear Optics

Wide-Band-Gap Metal-Free Perovskite for Third-Order Nonlinear Optics

First‐Principles Calculation Design for 2D Perovskite to Suppress Ion Migration for High‐Performance X‐ray Detection

Metal‐Free PAZE‐NH4X3⋅H2O Perovskite for Flexible Transparent X‐ray Detection and Imaging

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Metal‐Free PAZE‐NH₄X₃⋅H₂O Perovskite for Flexible Transparent X‐ray Detection and Imaging