Recent Advances in Lead Halide Perovskites for Radiation Detectors

Gao, Lei; Yan, Qingfeng

doi:10.1002/solr.201900210

Cited by 65 publications

(68 citation statements)

References 145 publications

(167 reference statements)

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“…The higher optical bandgap Eg of MAPbBr3 as compared to MAPbI3, leads to unsuitable it as active material for producing high PCE solar cells. Therefore, this perovskite is now mostly used for other applications, in particular for X-ray detectors due to high X-ray attenuation coefficient [3,15]. Figure 2 shows absorption spectra of thin films MAPbBr3 measured just after thermally annealing process (as-prepared, 0 h) and after 24 hours stored in ambient air at room temperature (T = 27C) with 70% relative humidity.…”

Section: Resultsmentioning

confidence: 99%

“…In the last decade, hybrid organic-inorganic perovskite MAPbX3 (MA = CH3NH3 + , X = halide ions I -, Brand Cl -) have great interrest for optoelectronic applications, such as solar cells, light-emitting diodes, photoelectric detectors, and high energy X/Gamma-ray detectors [1][2][3]. These perovskite materials exhibit excellent optoelectronic properties, including large optical absorption, high charge carrier mobility, long charge carrier diffusion length, tunability in optical bandgap and large X-ray attenuation coefficient [3][4][5]. Perovskite MAPbI3 is the mostly used as active material for solar cells with high power conversion efficiency (PCE).…”

Section: Introductionmentioning

confidence: 99%

“…However due to its large optical bandgap ( 2.2 eV), MAPbBr3 based solar cells showed smaller PCE than that of MAPbI3 [14]. Many groups have been using MAPbBr3 both in the form of thin films and single crystals for photoelectric and X-ray detectors rather than for solar cells application, due to its high stability against humidity [3]. Morphologycal and crystal orientation is highly needed for detectors application.…”

Section: Introductionmentioning

confidence: 99%

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Highly Oriented Cubic Crystalline Perovskite Thin Film of Methylammonium Lead Bromide

Bahtiar¹

2020

JIIF

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Organic-inorganic lead halide perovskite materials have been intensively developed for variety optoelectronic applications including solar cells, light-emitting diode and photodetection due to their excellent properties including bandgap tunability, long charge carrier diffusion length, and outstanding optoelectronic merits. Recently, perovskite methylammonium lead bromide (CH3NH3PbBr3 or MAPbBr3) has intensively studied for X-Ray detectors due to high stability against temperature and humidity and also has high X-Ray coefficient attenuation. Most of the perovskite-based optoelectronic devices are using thin films, whose their stability are highly depending on thin film morphology, including grain boundaries and crystal orientation. Morphological control, therefore, plays a significant role to produce high quality perovskite thin films. Thin films perovskite MAPbBr3 were prepared using spin-coating technique at room tempperature with 70% relative humidity. Its absorption spectra was measured using UV-Vis spectroscopy, its crystal structure using X-Ray Diffraction and morphology of thin films using Scanning Electron Microscopy (SEM). The optical bandgap of MAPbBr3 thin film is 2.23 eV derived from its absorption spectrum. The film is very stable against humidity confirmed by unchange of its absorption spectrum after 24 hours stored at room temperature with 70% relative humidity. The film shows cubic crystal structure with lattice constant 5.99 Å and high highly oriented in x-axis. The SEM images show cubic crystallites with size larger than 2 micrometer. The morphology of thin film and crystallite size are influenced by adding ethylammonium iodide additive or anti-solvent chlorobenzene treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly Oriented Cubic Crystalline Perovskite Thin Film of Methylammonium Lead Bromide

Bahtiar¹

2020

JIIF

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“…18,23,24 Recently, halide perovskites are emerging as a dark horse with promising photoconductive properties for direct X-ray imaging, including high efficiency for X-ray attenuation and charge transport on top of their solvent processibility. 23,[25][26][27] To date, both single-crystalline and polycrystalline perovskites, engineered by various strategies (eg, tuning chemical composition, reducing material dimension, controlling crystal orientation, etc. ), have been proposed for direct X-ray detection.…”

Section: Introductionmentioning

confidence: 99%

Halide perovskites: A dark horse for direct X‐ray imaging

Qian

Xiao

et al. 2020

EcoMat

123

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The high cost and difficulty of fabricating high-quality, thick, large-area X-ray absorbers limit their widespread applications in flat-panel direct hard X-ray imaging. Then it comes to the recently rising halide perovskites, which show large carrier mobility and lifetime, contain high atomic number elements and are solution processible, making them ideal for large-area direct hard X-ray imaging. Over the past few years, direct X-ray detectors based on a variety of perovskites have been developed, showing impressive progress in achieving high sensitivity and low detection limit. Alongside the developments, the underlying correlations between the intrinsic properties of the perovskites and their X-ray detection performance have been intensively studied, providing valuable information to tackle the remaining challenges, such as large dark current, baseline drifting and so forth. However, it is surprising to find that there have been no efforts to bring together a comprehensive review and comparative analysis on these previous research endeavors, and some general principles and guidelines of engineering the perovskites toward advanced X-ray detectors have yet to be creamed off. Here, recent advances in engineering perovskites for direct X-ray detection are reviewed in the hope of providing fundamental understanding of this fast-developing field. First, the operation principles of direct X-ray detectors targeting flat-panel X-ray imaging will be introduced, particularly relevant to perovskite materials. Then, recent innovative works regarding the preparation and manipulation of single-crystalline and poly-crystalline perovskites are discussed in detail, through which specific effects of the intrinsic properties of the perovskite upon X-ray detection are highlighted. This is followed by a summary of the review and outlook of future directions.

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“…[5] In contrast, perovskite-single-crystalline thin films show distinctive advantages because they have no grain boundaries thereby greatly reducing the trap density and show higher carrier mobility, longer carrier lifetime, and longer diffusion length. [6][7][8][9][10][11][12] Currently, there are two main methods for preparing perovskite-single-crystalline thin films: bottom-up method and topdown method. The bottom-up method means precursors grow directly into a single-crystalline film in confined space.…”

mentioning

confidence: 99%

A Centrifugal‐Force‐Assisted Wet‐Etching Approach toward Top‐Down Fabrication of Perovskite‐Single‐Crystalline Thin Films

Zhang

2020

ChemistrySelect

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Organic‐inorganic hybrid halide perovskite‐single‐crystalline thin films with high quality are promising for making high‐performance optoelectronic devices, but their fabrication is still challenging, particularly for the top‐down fabrication. Here, a facile centrifugal‐force‐assisted wet‐etching strategy is used in fabricating hybrid perovskite‐single‐crystalline thin film from its single‐crystalline wafer. The film thickness can be reduced to less than 20 micrometres and the film remains high quality and flat surface. Besides, this method can be used to regenerate surface‐metamorphic perovskite single crystals. The present technique may provide an effective strategy for single‐crystalline thin film preparation for demanding device applications and it is expected that this strategy would promise high‐efficient utilization of perovskite single crystals.

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Recent Advances in Lead Halide Perovskites for Radiation Detectors

Cited by 65 publications

References 145 publications

Highly Oriented Cubic Crystalline Perovskite Thin Film of Methylammonium Lead Bromide

Highly Oriented Cubic Crystalline Perovskite Thin Film of Methylammonium Lead Bromide

Halide perovskites: A dark horse for direct X‐ray imaging

A Centrifugal‐Force‐Assisted Wet‐Etching Approach toward Top‐Down Fabrication of Perovskite‐Single‐Crystalline Thin Films

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