Halide perovskites have shown promising potential for direct X-ray detection due to their high X-ray absorption coefficient, low trap states and convenient fabrication process. However, it is still a challenge to achieve high sensitivity, low dark current and low detection limit in a single material. The deep reason for this is the trade-off between the material’s μτ product and resistivity. Here we report the construction of an organic–inorganic hybrid anti-perovskite ((2-Habch)₃Cl(PtI₆)) with indirect transition and low orbital symmetry at the band edge to achieve an ultralong intrinsic lifetime and thus break the trade-off. (2-Habch)₃Cl(PtI₆) achieves an unprecedented long carrier lifetime of >3 ms, leading to a large μτ product of 6.25 × 10⁻³ cm² V⁻¹ and high resistivity of 10¹² Ω cm, outperforming most X-ray detection materials. These properties enabled the development of X-ray detectors that simultaneously achieve an ultralow dark current of 0.21 nA cm⁻², high sensitivity of 1.0 × 10⁴ µC Gy_air⁻¹ cm⁻², ultralow detection limit of 2.4 nGy_air s⁻¹ and excellent operational stability with no observable baseline drift, outperforming state-of-the-art perovskite single-crystal detectors. The rare combination of high performance in almost every figure of merit in the anti-perovskite-based X-ray detector could enable new-generation X-ray detection systems.

卤化物钙钛矿由于其高X射线吸收系数、低陷阱态和方便的制造工艺，在直接X射线检测方面显示出巨大的潜力。然而，在单一材料中实现高灵敏度、低暗电流和低检测限仍然是一个挑战。其深层原因在于材料的μτ乘积和电阻率之间的权衡。在这里，我们报告了一种有机-无机杂化反钙钛矿（(2-Habch) ₃ Cl(PtI ₆ )）的构建，该反钙钛矿具有间接跃迁和能带边缘的低轨道对称性，以实现超长的本征寿命，从而打破了贸易-离开。 (2-Habch) ₃ Cl(PtI ₆ ) 实现了前所未有的长载流子寿命 >3 ms，从而产生了 6.25 × 10 ⁻³ cm ² V ⁻¹的大μτ乘积和 10 ¹² Ω cm 的高电阻率，优于大多数材料X射线检测材料。这些特性使得X射线探测器的开发能够同时实现0.21 nA cm ^-2的超低暗电流、1.0 × 10 ⁴ µC Gy _Air ^-1 cm ^-2的高灵敏度、2.4 nGy _Air s ^-1的超低检测限。以及出色的运行稳定性，没有可观察到的基线漂移，性能优于最先进的钙钛矿单晶探测器。基于反钙钛矿的 X 射线探测器几乎在每个品质因数上都具有高性能，这种罕见的组合可以实现新一代 X 射线探测系统。