A zero-dimensional all-inorganic CsPbBr3 nanocrystal embedded Cs4PbBr6 scintillator has been achieved. Owing to the low dimensional quantum effect, this all-inorganic scintillator exhibits desirable scintillation performance.

Hybrid methylammonium lead tribromide (MAPbBr 3 ) perovskite has attracted great attention in ionization radiation detection. However, the charge collection remains a challenge. Here, fast response and high-sensitivity Xray detection based on MAPbBr 3 single crystals with a surface barrier Schottky diode has been achieved at room temperature. The Schottky surface barrier can overcome the large leakage current at a high electrical field, enabling us to reduce the noise and increase the charge collection efficiency. This surface barrier device has been demonstrated a 3 times improvement over the photoconductor based X-ray detector, which enables usage in nuclear medicine, especially for X-ray imaging technology.

A high Z CsPbBr 3 halide perovskite with large charge carrier diffusion length was used for radiation detection applications. The high sensitivity X-ray detector is expected to be used for imaging applications. The free-seeding CsPbBr 3 single crystals (SCs) were directly grown on ITO glass. We fabricated the Ag/CsPbBr 3 /ITO sandwich structural X-ray detector with Schottky contact at room temperature. We investigated the X-ray detection and phase-contrast X-ray imaging of the all-inorganic halide perovskite CsPbBr 3 SCs. The devices exhibit high performances with low dark current density (∼5− 27 nA/cm 2 ) and high sensitivity (770 μC•Gy −1 •cm −2 ) with an applied voltage of 8 V. An "L"-shape imaging was obtained based on the CsPbBr 3 SC X-ray detector array, which makes it a promising application for pixel X-ray imaging techniques.

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 ...