Template directed perovskite X-ray detectors towards low ionic migration and low interpixel cross talking

Zhu, Menghua; Du, Xiaolong; Niu, Guangda; Liu, Weiwei; Pan, Weicheng; Pang, Jincong; Wang, Wenyu; Chen, Chao; Ye, Xu; Tang, Jiang

doi:10.1016/j.fmre.2021.10.004

Cited by 9 publications

(11 citation statements)

References 33 publications

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“…In addition, through various measurements using X-ray diffraction and electron backscattering diffraction patterns, it was confirmed that the CsPbBr 3 films consisted of quasi-single crystals, leading to highly sensitive X-ray detection . Zhu et al applied the powder melting method for CsPbBr 2 I with porous anodic aluminum oxide (AAO) as a template and realized a columnar structure (Figure c) . In this structure, thanks to the insulating separator of the AAO, the cross-talking effect was suppressed.…”

Section: Promising Scalable Processesmentioning

confidence: 97%

“…48 Zhu et al applied the powder melting method for CsPbBr 2 I with porous anodic aluminum oxide (AAO) as a template and realized a columnar structure (Figure 7c). 50 In this structure, thanks to the insulating separator of the AAO, the cross-talking effect was suppressed.…”

Section: ■ Introductionmentioning

confidence: 94%

“…Copright 2019 Wiley. Part (c) is reprinted with permission from ref , which is licensed under a Creative Commons Attribution NonCommercial License 4.0 ().…”

Section: Promising Scalable Processesmentioning

confidence: 99%

“…Considering the difficulty of upscaling single crystals to the required area of at least 100 cm 2 , a scalable deposition process for polycrystalline perovskite films is required. Although various scalable processes have been proposed to fabricate perovskite films for direct X-ray detection, − there are only three reports, to the best of our knowledge, on the fabrication of Pe-FPDs due to additional challenges in the scalable processes such as uniformity and adhesion with TFT arrays. ,, …”

Section: Introductionmentioning

confidence: 99%

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Scalable Fabrication of Metal Halide Perovskites for Direct X-ray Flat-Panel Detectors: A Perspective

et al. 2022

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Metal halide perovskites are promising for direct X-ray detection applications thanks to their high X-ray absorption capability and excellent charge carrier transport. Single-pixelated perovskite Xray detectors have hitherto demonstrated excellent device performance, including high sensitivity and detectivity. On the other hand, multipixel flat-panel detectors (FPDs) that enable 2D X-ray imaging are undeveloped due to challenges in scalable deposition processes. In this perspective, we summarize promising scalable perovskite deposition processes and discuss the challenges and opportunities toward direct X-ray FPD applications.

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Section: Promising Scalable Processesmentioning

confidence: 97%

Section: ■ Introductionmentioning

confidence: 94%

“…Copright 2019 Wiley. Part (c) is reprinted with permission from ref , which is licensed under a Creative Commons Attribution NonCommercial License 4.0 ().…”

Section: Promising Scalable Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scalable Fabrication of Metal Halide Perovskites for Direct X-ray Flat-Panel Detectors: A Perspective

et al. 2022

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“…国亟待攻克的"卡脖子"技术之一。因此，研发先进的探测材料及技术为打破探测器领域自身的技术限制及国外技术封锁均具有十分重要的意义。 X 射线探测器分为直接型和间接型两种。相比于间接型，直接型探测器的像素串扰问题较少，理论空间分辨率更高 [4] 。非晶硒 (a-Se) [5] ，碲锌镉 (CZT) [6] 等是直接型 X 射线探测器的典型代表。目前，a-Se 与薄膜晶体管(TFT)阵列结合，实现了大面积二维 X 射线成像。然而， a-Se 对射线的吸收能力差，载流子迁移率低，以及易晶化导致了工作不稳定性，极大地限制了其应用范围。CZT 的基本性质十分契合 X 射线探测的需求，然而大尺寸、高质量的 CZT 制备困难，只有少数几个国家和地区掌握相关技术。 CZT 单晶的高温(>1000 ℃)制备工艺限制了其在商业 TFT 基板直接沉积的可能性。其他常见的直接型 X 射线探测材料：硅 [7] 、锗 [8] 、碘化汞 [9] 等存在 X 射线吸收能力和稳定性差等问题，应用也受到极大限制。近年来，卤化物钙钛矿由于光电性质优异、带隙可调、制备简单、成本低等优点，在材料科学、光电子领域引起了广泛关注 [10] 。钙钛矿的高原子序数 (Z) 和高载流子迁移率使其适用于 X 射线检测。与传统的 a-Se、CZT 相比，钙钛矿材料的主要优势如下： (1)缺陷容忍度高，载流子迁移率高和载流子寿命长。 (2)组分和结构可调，为材料性质调变提供了丰富的操作平台。 (3)制备方法简单多样，包括刮刀涂布 [11] 、旋涂 [12] 、喷涂 [13] 、热压 [14] 、模板辅助生长法 [15] 以及数字喷墨打印 [16] 等。根据八面体结构基元在不同方向上的连接方式，钙钛矿被分为三维(3D) 、2D、1D 和 0D 结构 [17] 。自 2015 年 Yakunin 等首次报道了基于 3D MAPbI3 多晶膜 X 射线探测器之后，钙钛矿 X 射线探测器取得了引人瞩目的进展，灵敏度>10 4 µC • Gyair −1 • cm −2 ，远优于商业化 a-Se 探测器 [18][19][20][21] 。然而，由于 3D 钙钛矿存在较严重的离子迁移，导致噪声大和基线漂移严重等问题，不利于获取低检测下限及高稳定性器件 [22] 。2021 年，Liu 等 [23] 发现具有复合 A 位阳离子的三维钙钛矿单晶可以在一定程度上抑制离子迁移。如何进一步抑制钙钛矿离子迁移是获得具有高稳定性 X 射线探测器的关键。研究发现，低维 (2D、 1D、0D)钙钛矿材料在微观结构上可以隔断离子迁移通道，进而更好地抑制离子迁移 [24] 。例如， MA3Bi2I9、Cs3Bi2I9、(NH4)3Bi2I9、Ruddlesden-Popper (RP)钙钛矿等低维材料的离子迁移激活能(Ea) 较大 [24][25][26][27][28][29]…”

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Research Progress on Low-dimensional Halide Perovskite Direct X-ray Detectors

Siyin¹,

Shujie²,

Ruihan³

et al. 2023

Journal of Inorganic Materials

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X-ray detection has been widely used in medical imaging, security inspection, and industrial non-destructive tests. Halide perovskite X-ray detectors have attracted increasing attention due to their high sensitivity and low detection limit, but the notorious ion migration leads to poor operational stability. It is reported that the low dimensional structure can effectively suppress the ion migration of perovskites, thus greatly improve the stability of the detectors. This review introduces the working mechanism, key performance parameters of perovskite X-ray detectors, and summarizes the recent progress of low-dimensional perovskite materials and their application in direct X-ray detectors. The relationship between the structural characteristics of low-dimensional perovskite materials and their X-ray detection performance was systematically analyzed. Low-dimensional perovskite is a promising candidate for the preparation of X-ray detectors with both high sensitivity and stability. Further optimization of detection material and device structure, preparation of large-area pixelated imaging devices, and study of working mechanism in-depth of the detector are expected to promote the practical application of perovskite X-ray detectors.

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Halide Perovskites and Their Derivatives for Efficient, High‐Resolution Direct Radiation Detection: Design Strategies and Applications

Dudipala,

Le,

Nie

et al. 2023

Advanced Materials

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The past decade has witnessed the rapid rise in performance of optoelectronic devices based on lead‐halide perovskites (LHPs). The large mobility‐lifetime products and defect tolerance of these materials, essential for optoelectronics, also make them well‐suited for radiation detectors, especially given the heavy elements present, which is essential for strong X‐ray and γ‐ray attenuation. Over the past decade, LHP thick films, wafers and single crystals have given rise to direct radiation detectors that have outperformed incumbent technologies in terms of sensitivity (reported values up to 3.5×106 μC Gyair−1 cm−2), limit of detection (directly measured values down to 1.5 nGyair s−1), along with competitive energy and imaging resolution at room temperature. At the same time, lead‐free perovskite‐inspired materials (e.g., methylammonium bismuth iodide), which have underperformed in solar cells, have recently matched and, in some areas (e.g., in polarization stability), surpassed the performance of LHP detectors. These advances open up opportunities to achieve devices for safer medical imaging, as well as more effective non‐invasive analysis for security, nuclear safety or product inspection. Herein, we discuss the principles behind the rapid rises in performance of LHP and perovskite‐inspired material detectors, and how their properties and performance link with critical applications in non‐invasive diagnostics. We discuss the key strategies to engineer the performance of these materials, and the important challenges to overcome to commercialize these new technologies.This article is protected by copyright. All rights reserved

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Template directed perovskite X-ray detectors towards low ionic migration and low interpixel cross talking

Cited by 9 publications

References 33 publications

Scalable Fabrication of Metal Halide Perovskites for Direct X-ray Flat-Panel Detectors: A Perspective

Scalable Fabrication of Metal Halide Perovskites for Direct X-ray Flat-Panel Detectors: A Perspective

Research Progress on Low-dimensional Halide Perovskite Direct X-ray Detectors

Halide Perovskites and Their Derivatives for Efficient, High‐Resolution Direct Radiation Detection: Design Strategies and Applications

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