MA3Bi2I9 single-crystal enables X-ray detection down to nanograys per second
X-ray detection down to nanograys per second by zero-dimensional MA3Bi2I9 single crystals Credit: ©Science China Press
Researchers from China Academy of Engineering Physics, Nanjing University and University of Victoria demonstrated ultra-sensitive and stable X-ray detectors by using a new kind of 0D MA3Bi2I9 single-crystals.
The disconnecting of the (Bi2I9)3- units in the lattice leads to a high activation energy (Ea) for ion migration (0.46 eV) and is also accompanied by a low dark carrier concentration (~ 10 6 cm-3). The suppressed ion migration and lowered dark carrier concentration enable the desirable combination of high sensitivity, low LoD, and stable operation.
X-ray detectors with a low LoD of 0.62 nGyair s-1 was achieved with a 100 kVp tungsten-target X-ray tube, which approaches the background radiation on Earth (~0.1 nGyair s-1), and is significantly lower than the dose rate required for X-ray diagnostics (5.5 μGyair s-1).
Additionally, the reported X-ray sensitivity of 10,620 μC Gyair-1 cm-2 is comparable to the values obtained in 3D perovskite detectors (1.1 × 10 4 μC Gyair-1 cm-2 for MAPbI3 and 2.1 × 10 4 μC Gyair-1 cm-2 for hybrid MAPbBr3/Si) and 2D perovskite detectors (8,400 μC Gyair-1 cm-2 for (NH4)3Bi2I9).
It is worth noting that, unlike 2D hybrid Bi halide perovskites that cannot obtain low LoD and high sensitivity in the same direction, 0D MA3Bi2I9 X-ray detectors achieve simultaneously low LoD and high X-ray sensitivity in the out-of-plane transport mode.
The 0D perovskite X-ray detectors exhibit stable operation even under high applied biases up to 120 V. No deterioration in detection performance was observed following an X-ray irradiation dose of ~23,800 mGyair, equivalent to > 200,000 times of the dose used in acquiring commercial X-ray chest radiographs.
The advance presented herein provides a promising X-ray detector candidate in X-ray imaging and medical applications. This work was published in Journal of Energy Chemistry.
###
See the article: https:/
This work is supported by the National Natural Science Foundation of China (Grant Nos. 21773218, 61974063), the Sichuan Province (Grant No. 2018JY0206) and the Presidential Foundation of CAEP (Grant No. YZJJLX2018007).
Media Contact
More Information:
http://dx.doi.org/10.1016/j.jechem.2020.02.049All latest news from the category: Physics and Astronomy
This area deals with the fundamental laws and building blocks of nature and how they interact, the properties and the behavior of matter, and research into space and time and their structures.
innovations-report provides in-depth reports and articles on subjects such as astrophysics, laser technologies, nuclear, quantum, particle and solid-state physics, nanotechnologies, planetary research and findings (Mars, Venus) and developments related to the Hubble Telescope.
Newest articles
How marine worms regenerate lost body parts
The return of cells to a stem cell-like state as the key to regeneration. Many living organisms are able to regenerate damaged or lost tissue, but why some are particularly…
Nano-scale molecular detective
New on-chip device uses exotic light rays in 2D material to detect molecules. Researchers have developed a highly sensitive detector for identifying molecules via their infrared vibrational “fingerprint”. Published in Nature…
Novel CAR T-cell therapy
… demonstrates efficacy and safety in preclinical models of HER2-positive solid tumors. The p95HER2 protein is found expressed in one third of HER2+ tumors, which represent 4% of all tumors….