Songshan Lake Materials Laboratory, 523808, Dongguan, Guangdong, P. R. China.
Fujian Provincial Key Laboratory of Welding Quality Intelligent Evaluation, Longyan University, Longyan, Fujian, P. R. China.
Nat Commun. 2023 Mar 23;14(1):1621. doi: 10.1038/s41467-023-37297-z.
X-ray detectors must be operated at minimal doses to reduce radiation health risks during X-ray security examination or medical inspection, therefore requiring high sensitivity and low detection limits. Although organolead trihalide perovskites have rapidly emerged as promising candidates for X-ray detection due to their low cost and remarkable performance, these materials threaten the safety of the human body and environment due to the presence of lead. Here we present the realization of highly sensitive X-ray detectors based on an environmentally friendly solution-grown thick BiI/BiI/BiI (BiI) van der Waals heterostructure. The devices exhibit anisotropic X-ray detection response with a sensitivity up to 4.3 × 10 μC Gy cm and a detection limit as low as 34 nGy s. At the same time, our BiI detectors demonstrate high environmental and hard radiation stabilities. Our work motivates the search for new van der Waals heterostructure classes to realize high-performance X-ray detectors and other optoelectronic devices without employing toxic elements.
X 射线探测器在 X 射线安检或医疗检查过程中必须以最低剂量运行，以降低辐射对健康的风险，因此需要高灵敏度和低检测限。尽管有机卤化铅钙钛矿由于其低成本和优异的性能而迅速成为 X 射线检测的有前途的候选材料，但由于存在铅，这些材料会威胁到人体和环境的安全。在这里，我们提出了一种基于环保溶液生长的厚 BiI/BiI/BiI（BiI）范德华异质结的高灵敏度 X 射线探测器的实现。该器件表现出各向异性的 X 射线探测响应，灵敏度高达 4.3×10μC Gy cm，检测限低至 34 nGy s。同时，我们的 BiI 探测器表现出高的环境和硬辐射稳定性。我们的工作激发了对新型范德华异质结构类别的探索，以实现无毒性元素的高性能 X 射线探测器和其他光电器件。
