X-ray sensitivity of Cd0.9Zn0.1Te detectors

Centimeter‐Sized Single Crystal of Two‐Dimensional Halide Perovskites Incorporating Straight‐Chain Symmetric Diammonium Ion for X‐Ray Detection

“…The X‐ray sensitivity (S) of a photoconductive X‐ray detector is defined as the collected charge per unit area per unit of radiation exposure (μC Gy air −1 cm −2 ) and considered an important parameter for superior imaging. The X‐ray sensitivity S of the detectors can be calculated by the formula: …”

“…Current commercial X-ray detection is mainly dominated by inorganic semiconductors,s uch as amorphous Se (a-Se), [1,2] Si, [3] and Cd(Zn)Te. [4,5] Complicated fabrication techniques and high fabrication cost present obstacles for their further popularization. In recent years,o rganic-inorganic hybrid perovskite materials start to arouse attention in X-ray detection because of the outstanding properties of these materials,i ncluding low trap density,l ong carrier lifetime, high carrier mobility, [6] and low-cost fabrication.…”

Large Lead‐Free Perovskite Single Crystal for High‐Performance Coplanar X‐Ray Imaging Applications

“…In addition to the a‐Se, many other traditional semiconductors, such as Si, [ 8,9 ] TlBr, [ 10,11 ] PbI 2 , [ 12,13 ] Ge, [ 14,15 ] HgI 2 , [ 16,17 ] CdZnTe, [ 18,19 ] and PbO, [ 20,21 ] have been well studied, and among of them, especially CdZnTe, has shown potential applications in commercial X‐ray detectors. However, most of these materials either possess very high dark current and low sensitivity, or suffer from needing high‐temperature (exceeding 500 °C) and complex growth equipment, let alone their high toxicity (cadmium (Cd), thallium (Tl), lead (Pb), and mercury (Hg)).…”

Exploring Lead‐Free Hybrid Double Perovskite Crystals of (BA)2CsAgBiBr7 with Large Mobility‐Lifetime Product toward X‐Ray Detection

“…We thus proceeded to investigate the performance of our vertical-type devices under X-ray source.T he behavior was studied by recording the photocurrent under atungsten anode X-ray tube with the energy of 70 keV and the X-ray dose was governed by the current of the tube.The current signal under constant bias of 10 Vand increasing dose rates (Supporting Information, Figure S11) exhibits anearly linear relationship with the X-ray dose rate.The slope of this linear fit is defined as the sensitivity of the device and affording as ensitivity of 4.2 mCGy air À1 cm À2 (Figure 4c), which is superior to that of MAPbI 3 polycrystalline perovskite X-ray detectors (Supporting Information, Table S4). [20] Furthermore,t he sensitivity of our devices is nearly comparable to Cd(Zn)Tes ingle-crystal detectors, [21] and almost catches up with Cs 2 AgBiBr 6 singlecrystal devices of 8 mCGy air À1 cm À2 , [3] despite the bias applied. It is believed that substantially improved response in the Xray regime could be expected for (BA) 2 CsAgBiBr 7 detectors after subtle device engineering and the change in the direction of electric field.…”

“…The slope of this linear fit is defined as the sensitivity of the device and affording a sensitivity of 4.2 μC Gy air −1 cm −2 (Figure c), which is superior to that of MAPbI 3 polycrystalline perovskite X‐ray detectors (Supporting Information, Table S4) . Furthermore, the sensitivity of our devices is nearly comparable to Cd(Zn)Te single‐crystal detectors, and almost catches up with Cs 2 AgBiBr 6 single‐crystal devices of 8 μC Gy air −1 cm −2 , despite the bias applied. It is believed that substantially improved response in the X‐ray regime could be expected for (BA) 2 CsAgBiBr 7 detectors after subtle device engineering and the change in the direction of electric field .…”