Sensitive X-ray detectors are essential for medical diagnostics, nondestructive product inspection and security screening. However, commercially available X-ray instruments require high dosages for imaging. Further lowering the radiation dose will reduce health risks to patients; and will also increase the frequency with which X-ray images can safely be acquired, ultimately paving the way toward truly personalized patient care. Halide perovskites are recently demonstrated as promising candidates for direct X-ray detection. However, the high and unstable dark current, caused by ion migration and high dark carrier concentration in the three-dimensional (3D) hybrid perovskites, limits their performance and long-term operation stability. Here, we will introduce our recent research progress on ultrasensitive, stable X-ray detectors made by low dimensional perovskites. The low dimensional crystal structure leads to a high activation energy (Ea) for ion migration and a low dark carrier concentration, which can guarantee a low noise level and good operational stability under a large external bias. X-ray detectors exhibit sensitivity ~104 μC Gyair−1 cm−2, a limit of detection (LoD) of several nGyair s−1, and stable operation even under high applied biases, which are much better than those of the commercialized amorphous selenium detector. Our results provide new X-ray detection candidates to achieve sensitive, and stable X-ray detectors, which will pave a way of exploring new generation of ultrasensitive and stable X-ray detectors.

Ultrasensitive and stable perovskite X-ray detectors

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ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.