Low ionic migration is required for a semiconductor material to realize stable high‐performance X‐ray detection. In this work, successful controlled incorporation of not only methylammonium (MA⁺) and cesium (Cs⁺) cations, but also bromine (Br^–) anions into the FAPbI₃ lattice to grow inch‐sized stable perovskite single crystal (FAMACs SC) is reported. The smaller cations and anions, comparing to the original FA⁺ and I^– help release lattice stress so that the FAMACs SC shows lower ion migration, enhanced hardness, lower trap density, longer carrier lifetime and diffusion length, higher charge mobility and thermal stability, and better uniformity. Therefore, X‐ray detectors made of the superior FAMACs SCs show the highest sensitivity of (3.5 ± 0.2) × 10⁶ μC Gy_air⁻¹ cm⁻², about 29 times higher than the latest record of 1.22 × 10⁵ μC Gy_air⁻¹ cm⁻² for polycrystalline MAPbI₃ wafer under the same 40 keV X‐ray radiation. Furthermore, the FAMACs SC X‐ray detector shows a low detection limit of 42 nGy s⁻¹, stable dark current, and photocurrent response. Finally, it is demonstrated that high contrast X‐ray imaging is realized using the FAMACs SC detector. The effective triple‐cation mixed halide strategy and the high crystalline quality make the present FAMACs SCs promising for next‐generation X‐ray imaging systems.

中文翻译：

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用于高性能X射线成像的三阳离子和混合卤化物钙钛矿单晶

半导体材料需要低离子迁移才能实现稳定的高性能X射线检测。在这项工作中，成功的控制不仅甲基铵的掺入（MA ⁺）和铯（Cs ⁺）阳离子，但也溴（Br ^- ）阴离子进入FAPbI ₃晶格成长英寸大小的稳定钙钛矿的单晶（FAMACs SC）是报告。较小的阳离子和阴离子，比较原来的FA ⁺和我^-帮助释放晶格应力，以便FAMACs SC显示出更低的离子迁移，更高的硬度，更低的陷阱密度，更长的载流子寿命和扩散长度，更高的电荷迁移率和热稳定性以及更好的均匀性。因此，由上级FAMACs的X射线检测器的SC显示的（3.5±0.2）×10的最高灵敏度⁶ μC戈瑞_空气^-1厘米^-2，约29比1.22×10的最新记录倍⁵ μC戈瑞_空气在相同的40 keV X射线辐射下，多晶MAPbI ₃晶片的^-1 cm ^-2。此外，FAMACs SC X射线探测器的探测下限低至42 nGy s ^-1，稳定的暗电流和光电流响应。最后，证明了使用FAMACs SC检测器可以实现高对比度X射线成像。有效的三阳离子混合卤化物策略和高结晶质量使当前的FAMACs SC有望用于下一代X射线成像系统。