Two-Dimensional Metal Halides for X-Ray Detection Applications

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Май 20, 2023

Abstract Metal halide perovskites have recently emerged as promising candidates for the next generation of X-ray detectors due to their excellent optoelectronic properties. Especially, two-dimensional (2D) afford many distinct properties, including remarkable structural diversity, high energy, and balanced large exciton binding energy. With advantages 2D materials perovskites, it successfully reduces decomposition phase transition perovskite effectively suppresses ion migration. Meanwhile, existence a hydrophobic spacer can block water molecules, thus making obtain stability. All these attracted much attention in field detection. This review introduces classification summarizes synthesis technology performance characteristics direct detector, briefly discusses application scintillators. Finally, this also emphasizes key challenges faced by practical presents our views on its future development.

Язык: Английский

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Molecular Design of Layered Hybrid Silver Bismuth Bromine Single Crystal for Ultra‐Stable X‐Ray Detection With Record Sensitivity

Advanced Materials, Год журнала: 2023, Номер 36(6)

Опубликована: Ноя. 28, 2023

Abstract Nowadays, weak interlayer coupling and unclear mechanism in layered hybrid silver bismuth bromine (LH‐AgBiBr) are the main reasons for limiting its further enhanced X‐ray detection sensitivity stability. Herein, design rules LH‐AgBiBr influence on performance reported first time. Although shortening amine size can enhance coupling, is severely hampered by easier defect formation caused enlarged micro strain. In contrast, an appropriate divalent endows material with improved released strain, which benefits crystal stability mechanical hardness. Another contribution to increase density dielectric constant; thus, enhancing absorption carrier transport. Consequently, optimized parallel device based BDA 2 AgBiBr 8 achieves a record of 2638 µC Gy air −1 cm −2 ultra‐low limit 7.4 nGy s , outperforming other detectors. Moreover, unencapsulated displays remarkable anti‐moisture, anti‐thermal (>150 °C), anti‐radiation (>1000 ) endurance. Eventually, high‐resolution hard imaging demonstrated linear detector arrays under benign dose rate (1.63 µGy low external bias (5 V). Hence, these findings provide guidelines future materials optimization.

Язык: Английский

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Low‐Dose and Stable X‐Ray Imaging Enabled by Low‐Dimensional Dion‐Jacobson Perovskites

Advanced Functional Materials, Год журнала: 2024, Номер 34(38)

Опубликована: Март 21, 2024

Abstract Metal halide perovskites have emerged as highly promising candidates for next‐generation X‐ray detectors due to their facile and low‐cost processability, high attenuation coefficient, tunable optoelectrical properties. In this work, quasi‐2D Dion‐Jacobson (DJ) are introduced in a flat panel imager (FPXI) imaging. This study demonstrates that the diammonium interlayers DJ play key role enhancing structural stability, suppressing ion migration, improving charge transport. As result, perovskite‐based FPXIs achieve sensitivity of 18000 µC Gy air −1 cm −2 , low detection limit 5.7 nGy s representing performance comparable state‐of‐the‐art 3D perovskite FPXIs. Thanks decrease signal crosstalk effect FPXIs, spatial resolution 0.54 line‐pair‐per‐pixel is achieved, which higher than Remarkably, high‐quality imaging achieved at total dose 20 µGy only 1/5 typically used commercial equipment. work not provides valuable insights guidance fabrication 2D but also lays groundwork adoption high‐performance, stable imagers novel flat‐panel detectors.

Язык: Английский

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Pyroelectric Photoconductive Diode for Highly Sensitive and Fast DUV Detection

Advanced Materials, Год журнала: 2024, Номер 36(25)

Опубликована: Апрель 2, 2024

Abstract Detecting high‐energy photons from the deep ultraviolet (DUV) to X‐rays is vital in security, medicine, industry, and science. Wide bandgap (WBG) semiconductors exhibit great potential for detecting photons. However, implementation of highly sensitive high‐speed detectors based on WBG has been a huge challenge due inevitable level traps lack appropriate device structure engineering. Here, fast pyroelectric photoconductive diode (PPD), which couples interface effect with tailored polycrystal Ga‐rich GaOx (PGR‐GaOx) Schottky photodiode, first proposed. The PPD exhibits ultrahigh detection performance DUV X‐ray light. responsivity light sensitivity are up 10 4 A W −1 5 µ C Gy air cm −2 , respectively. Especially, induced by polar symmetry depletion region PGR‐GaOx can significantly improve response speed times. Furthermore, demonstrated imaging enhancement systems low power consumption high sensitivity. This work fully excavates provides novel design strategy achieve detectors.

Язык: Английский

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Molecularly thin, two-dimensional all-organic perovskites

Science, Год журнала: 2024, Номер 384(6691), С. 60 - 66

Опубликована: Апрель 4, 2024

Recently, the emergence of all-organic perovskites with three-dimensional (3D) structures has expanded potential applications perovskite materials. However, synthesis and utilization in 2D form remain largely unexplored because design principle not been developed. We present successful a metal-free layered perovskite, denoted as Choi-Loh van der Waals phase (CL-v phase), chemical formula A

Язык: Английский

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Enhanced thermodynamic stability and carrier lifetime in BF4 -doped wide-band-gap perovskite solar cells

Physical review. B./Physical review. B, Год журнала: 2024, Номер 110(4)

Опубликована: Июль 23, 2024

Язык: Английский

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Tailoring Multi‐Phenyl Ring Cation for Stable Scalable Hybrid Bismuth Iodide Amorphous Film: Enabling Record Sensitivity and High‐Performance X‐Ray Array Imaging

Advanced Materials, Год журнала: 2024, Номер 36(33)

Опубликована: Июнь 22, 2024

The 329-type bismuth (Bi)-based metal halide (MH) polycrystalline films have potential to be applied in the new generation of X-ray imaging technology owing high absorption coefficients and excellent detection properties. However, mutually independent [Bi

Язык: Английский

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High Sensitivity X‐Ray Detectors with Low Degradation Based on Deuterated Halide Perovskite Single Crystals

Advanced Materials, Год журнала: 2024, Номер 36(44)

Опубликована: Сен. 16, 2024

Abstract Methylammonium lead single crystal (MAPbI 3 SC) possesses superior optoelectronic properties and low manufacturing cost, making it an ideal candidate for X‐ray detection. However, the ionic migration of perovskites usually leads to instability, dark current drift, hysteresis detector, limiting their applications in well‐established technologies. Here, a series detectors MAPbI SCs are reported with different degrees deuteration (D x , = 0, 0.15, 0.75, 0.99). By controlling content deuterium (D) organic cations, sensitivity, detection limits, ion migration, resistivity detector can be controlled, thereby improving its performance. Due stronger hydrogen bonds (N─D···I), activation energy significantly increases 886 meV. Consequently, D 0.99 SC shows more than five‐fold enhancement, achieving record‐high mobility–lifetime (µ τ ) product 5.39 × 10 −2 cm 2 V −1 ultrahigh sensitivity 2.18 6 µC Gy under 120 keV hard limit 4.8 nGy air s as well long‐term stability. The study provides straightforward strategy constructing ultrasensitive imaging systems based on perovskite SCs.

Язык: Английский

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Cesium‐Based Molecular Perovskites With Superior Stability for High‐Performance X‐Ray Detection

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 16, 2025

Metal-free molecular perovskites have shown great potential for X-ray detection due to their tunable chemical structures, low toxicity, and excellent photophysical properties. However, limited absorption environmental instability restrict practical application. In this study, cesium-based (MDABCO-CsX3, X = Cl, Br, I) are developed by introducing Cs+ at the B-site enhance while retaining toxicity. The effects of halide modulation on physical properties device performance systematically investigated. Among variants, MDABCO-CsBr3 exhibited superior stability, attributed optimal ionic radius high stability Br-. This is further enhanced a higher tolerance factor, which promotes stable 3D cubic structure suppresses ion migration within crystal. Consequently, MDABCO-CsBr3-based detectors demonstrated reduced migration, minimal dark current drift, response under exposure, achieving sensitivity 4124 µC Gy-1 cm-2 limit 0.45 µGy s-1. Moreover, devices exhibit thermal operating effectively temperatures up 130 °C. These results highlight as promising candidate efficient detection, expanding applicability in advanced radiation technologies.

Язык: Английский

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Dimensionality Engineering of Organic–Inorganic Halide Perovskites for Next‐Generation X‐Ray Detector

Small, Год журнала: 2023, Номер 20(16)

Опубликована: Ноя. 28, 2023

Abstract The next‐generation X‐ray detectors require novel semiconductors with low material/fabrication cost, excellent response characteristics, and robust operational stability. family of organic‐inorganic hybrid perovskites (OIHPs) materials comprises a range crystal configuration (i.e., films, wafers, single crystals) tunable chemical composition, structures, electronic properties, which can perfectly meet the multiple‐stringent requirements high‐energy radiation detection, making them emerging as cutting‐edge candidate for detectors. From perspective molecular dimensionality, physicochemical optoelectronic characteristics OIHPs exhibit dimensionality‐dependent behavior, thus structural dimensionality is recognized key factor that determines device performance OIHPs‐based Nevertheless, correlation between their still short theoretical guidance, become bottleneck impedes development efficient In review, advanced studies on engineering are critically assessed in detection application, discussing current understanding “dimensionality‐property” relationship state‐of‐the‐art progresses dimensionality‐engineered detector, highlight open challenges future outlook this field.

Язык: Английский

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