Liu Chuanqi, Zhang Wen, Yang Dingyu, Tian Haibo, Zhu Jun
College of Physics, Sichuan University, Chengdu 610065, China.
College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu 610225, China.
Materials (Basel). 2023 Feb 21;16(5):1783. doi: 10.3390/ma16051783.
The all-inorganic perovskite cesium lead bromine (CsPbBr) has attracted much attention in the field of X-ray detectors because of its high X-ray absorption coefficient, high carrier collection efficiency, and easy solution preparation. The low-cost anti-solvent method is the main method to prepare CsPbBr; during this process, solvent volatilization will bring a large number of holes to the film, leading to the increase of defects. Based on the heteroatomic doping strategy, we propose that Pb should be partially replaced by Sr to prepare leadless all-inorganic perovskite. The introduction of Sr promoted the ordered growth of CsPbBr in the vertical direction, increased the density and uniformity of the thick film, and achieved the goal of CsPbBr thick film repairing. In addition, the prepared CsPbBr and CsPbBr:Sr X-ray detectors were self-powered without external bias, maintaining a stable response during on and off states at different X-ray dose rates. Furthermore, the detector base on 160 µm CsPbBr:Sr had a sensitivity of 517.02 µC Gy cm at zero bias under the dose rate of 0.955 µGy ms and it obtained a fast response speed of 0.053-0.148 s. Our work provides a new opportunity to produce cost-effective and highly efficient self-powered perovskite X-ray detectors in a sustainable way.
全无机钙钛矿铯铅溴（CsPbBr）因其高X射线吸收系数、高载流子收集效率和易于溶液制备，在X射线探测器领域备受关注。低成本的反溶剂法是制备CsPbBr的主要方法；在此过程中，溶剂挥发会给薄膜带来大量空穴，导致缺陷增加。基于杂原子掺杂策略，我们提出用Sr部分取代Pb来制备无铅全无机钙钛矿。Sr的引入促进了CsPbBr在垂直方向上的有序生长，提高了厚膜的密度和均匀性，实现了CsPbBr厚膜修复的目标。此外，制备的CsPbBr和CsPbBr:Sr X射线探测器无需外部偏压即可自供电，在不同X射线剂量率的开和关状态下保持稳定响应。此外，基于160 µm CsPbBr:Sr的探测器在0.955 µGy ms的剂量率下零偏压时的灵敏度为517.02 µC Gy cm，响应速度为0.053 - 0.148 s。我们的工作为以可持续方式生产具有成本效益和高效的自供电钙钛矿X射线探测器提供了新机会。
