Halide perovskites scintillators: unique promise and current limitations

Moseley, Oliver D. I.; Doherty, Tiarnan A. S.; Parmee, Richard; Anaya, Miguel; Stranks, Samuel D.

doi:10.1039/d1tc01595h

Cited by 55 publications

(55 citation statements)

References 163 publications

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“…Lead halide perovskites (HaP) of the form APbX 3 have attracted renewed research interest for over a decade, motivated by initially dramatic gains in HaP solar cell efficiencies and now other optoelectronic applications 1 – 5 . The prototypical A-site cations (A-cations) are organic (methylammonium or MA + , formamidinium or FA + ) or inorganic (Cs + ), the B-site cation is lead(II) and the X-site anion is iodide/bromide/chloride.…”

Section: Introductionmentioning

confidence: 99%

A-site cation influence on the conduction band of lead bromide perovskites

et al. 2022

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Hot carrier solar cells hold promise for exceeding the Shockley-Queisser limit. Slow hot carrier cooling is one of the most intriguing properties of lead halide perovskites and distinguishes this class of materials from competing materials used in solar cells. Here we use the element selectivity of high-resolution X-ray spectroscopy and density functional theory to uncover a previously hidden feature in the conduction band states, the σ-π energy splitting, and find that it is strongly influenced by the strength of electronic coupling between the A-cation and bromide-lead sublattice. Our finding provides an alternative mechanism to the commonly discussed polaronic screening and hot phonon bottleneck carrier cooling mechanisms. Our work emphasizes the optoelectronic role of the A-cation, provides a comprehensive view of A-cation effects in the crystal and electronic structures, and outlines a broadly applicable spectroscopic approach for assessing the impact of chemical alterations of the A-cation on perovskite electronic structure.

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Section: Introductionmentioning

confidence: 99%

A-site cation influence on the conduction band of lead bromide perovskites

et al. 2022

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“…However, their properties such as fast decay times, narrow emission bands, and high light yield are also desirable for scintillation detectors. Some papers have been published on this topic [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ], but not nearly as many.…”

Section: Introductionmentioning

confidence: 99%

Scintillation Response Enhancement in Nanocrystalline Lead Halide Perovskite Thin Films on Scintillating Wafers

et al. 2021

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Lead halide perovskite nanocrystals of the formula CsPbBr3 have recently been identified as potential time taggers in scintillating heterostructures for time-of-flight positron emission tomography (TOF-PET) imaging thanks to their ultrafast decay kinetics. This study investigates the potential of this material experimentally. We fabricated CsPbBr3 thin films on scintillating GGAG:Ce (Gd2.985Ce0.015Ga2.7Al2.3O12) wafer as a model structure for the future sampling detector geometry. We focused this study on the radioluminescence (RL) response of this composite material. We compare the results of two spin-coating methods, namely the static and the dynamic process, for the thin film preparation. We demonstrated enhanced RL intensity of both CsPbBr3 and GGAG:Ce scintillating constituents of a composite material. This synergic effect arises in both the RL spectra and decays, including decays in the short time window (50 ns). Consequently, this study confirms the applicability of CsPbBr3 nanocrystals as efficient time taggers for ultrafast timing applications, such as TOF-PET.

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“…Recently, metal halide perovskite (MHP) and their derived structural materials have attracted great interest as a new generation of scintillators by virtue of their desirable properties, such as high Z atoms existence, bright, and tunable RL, passable radiation hardness, facile solution-processability, and costeffectiveness. [21,22,25] Among the perovskite communities, allinorganic CsPbBr 3 nanocrystals have been extensively studied as an exemplary scintillator material, which exhibit near-unity photoluminescence quantum yield (PLQY), fast decay time, low detection limit, and high spatial resolution in X-ray ima ging. [11,13,17,26,27] However, the barriers of CsPbBr 3 nanocrystals are that: 1) the low effective atomic number cannot guarantee sufficient X-ray energy absorption because they are usually dispersed in a solution at a low concentration [13] (when dispersed at a high concentration, cluster formation and massively increased surface/bulk ratio deteriorate the luminescence performance and stability, respectively [26][27][28] ); 2) the unavoidable self-absorption phenomenon caused by the intrinsic small Stokes shift greatly reduces the light output efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…[19,20] Their limitation lies in the high-cost caused by the complicated and time-consuming vacuum fabrication procedures. [21,22] Plastic scintillators, consisting of embedded or coated with scintillation materials, have the advantages of mechanical plasticity, fast decay time, and remarkable radiation resistance. They may seem to be economical alternatives to conventional inorganic scintillation crystals.…”

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confidence: 99%

Highly Efficient and Flexible Scintillation Screen Based on Manganese (II) Activated 2D Perovskite for Planar and Nonplanar High‐Resolution X‐Ray Imaging

Shao

Wang

Zhang

et al. 2022

Advanced Optical Materials

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power. [1] X-ray detection technology, as a derivative of its own special properties, plays a key role in multiple applications, including medical radiography, safety surveillance, industrial flaw inspection, and scientific research. [2][3][4] Especially for the global pandemic of Corona Virus Disease 2019, X-ray radiograph and computed tomography scan were employed as rapid and accurate autodetection methods to reveal abnormal lung indications for disease diagnosis. [5] Modern X-ray detectors with the advantages of digital image processing, massive storage capability, data sharing have almost replaced the traditional film-based detectors. Currently, two available schemes were adopted for X-ray detection: direct-detection based on semiconductor materials operating in currentto-current mode, [6][7][8] and indirect-detection based on scintillators working in photonto-current mode. [9][10][11][12][13][14][15][16][17][18] Indirect-detection type X-ray detectors occupy the majority of the market share because of their relatively low-cost and stability. [11,16] As the core component of the detector, scintillator is capable of converting X-ray into ultraviolet (UV)/visible light that can be collected by a sensor array (such as photomultiplier tube, [14] multipixel photon counter, [15] charge-coupled device, [16] and complementary metal-oxide-semiconductor). [17,18] Development over the decades has witnessed the emergence of various scintillators, which were classified according to their own characteristics to fit the demands of different occasions. Yet several issues and limitations still remain. For example, needle-like column CsI (Tl) crystals were commonly used as mainstream products in X-ray imaging applications, due to their large X-ray conversion efficiency, high light yield, and low light-crosstalk. [19,20] Their limitation lies in the high-cost caused by the complicated and time-consuming vacuum fabrication procedures. [21,22] Plastic scintillators, consisting of embedded or coated with scintillation materials, have the advantages of mechanical plasticity, fast decay time, and remarkable radiation resistance. They may seem to be economical alternatives to conventional inorganic scintillation crystals. [23,24] However, they are plagued by relatively low density, weak radioluminescence (RL) emission and poor thermal stability. Since the wide range X-ray imaging technology covers a wide range of applications in the medical, industrial, and scientific research fields. Highly sensitive, flexible, and cost-effective scintillation screens are of great importance for X-ray imaging applications. In this paper, manganese (II) activated 2D butylammonium lead bromide perovskite, namely BA 2 PbBr 4 :Mn (II), is demonstrated as a highly efficient and low-cost X-ray scintillator. The appropriate amount of Mn (II) dopant can act as an activator for achieving the optimization of luminescence performance through efficient energy transfer. This produces a large Stokes shift thus almost eliminates the effect of self-absorption. As ...

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Halide perovskites scintillators: unique promise and current limitations

Abstract: The widespread use of X- and gamma-rays in a range of sectors including healthcare, security and industrial screening is underpinned by the efficient detection of the ionising radiation. Such detector...

Cited by 55 publications

References 163 publications

A-site cation influence on the conduction band of lead bromide perovskites

A-site cation influence on the conduction band of lead bromide perovskites

Scintillation Response Enhancement in Nanocrystalline Lead Halide Perovskite Thin Films on Scintillating Wafers

Highly Efficient and Flexible Scintillation Screen Based on Manganese (II) Activated 2D Perovskite for Planar and Nonplanar High‐Resolution X‐Ray Imaging

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