Zhao Zihao, Fan Qingshun, Liu Yi, Rong Hao, Ni Huaimin, Wei Linjie, Zhao Xianmei, Luo Junhua, Sun Zhihua
University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
ACS Appl Mater Interfaces. 2024 Jul 24;16(29):38283-38289. doi: 10.1021/acsami.4c08648. Epub 2024 Jul 16.
Bismuth-based halide perovskites have shown great potential for direct X-ray detection, attributable to their nontoxicity and advantages in detection sensitivity and spatial resolution. However, the practical application of such materials still faces the critical challenge of combining both high sensitivity and low detection limits. Here, we report a new type of zero-dimensional (0D) perovskite (HIS)BiI (, where HIS = histamine) with high sensitivity and a low detection limit. Structurally, the strong N-H···I hydrogen bonds between HIS cations and inorganic frameworks enhance the rigidity of the structure and diminish the intermolecular distance between adjacent inorganic [BiI] dimers. By virtue of such structural merits, single crystal exhibits excellent physical properties perpendicular to both the (001) and (010) faces. Perpendicular to the (010) face, exhibited a high electrical resistivity (2.31 × 10 Ω cm) and a large carrier mobility-lifetime product () (2.81 × 10 cm V) under X-ray illumination. Benefiting from these superior physical properties, it demonstrates an excellent X-ray detection capability with a sensitivity of approximately 10 μC Gy cm and a detection limit of 36 nGy s in both directions perpendicular to the (001) and (010) crystal faces. These results provide a promising candidate material for the development of new, lead-free, high-performance X-ray detectors.
铋基卤化物钙钛矿因其无毒以及在检测灵敏度和空间分辨率方面的优势，在直接X射线检测中展现出巨大潜力。然而，这类材料的实际应用仍面临着同时兼顾高灵敏度和低检测限这一关键挑战。在此，我们报道了一种新型的零维（0D）钙钛矿（HIS）BiI（其中HIS = 组胺），它具有高灵敏度和低检测限。在结构上，HIS阳离子与无机骨架之间强烈的N-H···I氢键增强了结构的刚性，并减小了相邻无机[BiI]二聚体之间的分子间距离。凭借这种结构优点，单晶在垂直于（001）和（010）面的方向上均表现出优异的物理性能。垂直于（010）面，在X射线照射下，其表现出高电阻率（2.31×10Ω·cm）和大的载流子迁移率-寿命乘积（）（2.81×10cm² V）。受益于这些优异的物理性能，它在垂直于（001）和（010）晶面的两个方向上均展现出出色的X射线检测能力，灵敏度约为10μC Gy⁻¹ cm⁻²，检测限为36 nGy s⁻¹。这些结果为开发新型无铅高性能X射线探测器提供了一种有前景的候选材料。
