High‐Performing Direct X‐Ray Detection Made of One‐Dimensional Perovskite‐Like (TMHD)SbBr₅ Single Crystal With Anisotropic Response

3D and 2D organic hybrid perovskites, as well as double perovskites, have demonstrated their suitability for direct X-ray detection. However, the sensitivity and stability of 3D perovskite X-ray detectors are currently being hindered by the existing constraints on ion movement. Therefore, there is an immediate need to develop X-ray detectors that are both highly sensitive and stable while also being environmentally friendly. The novel low-dimensional perovskites demonstrate exceptional inherent stability and effectively mitigate ion migration, thereby showcasing their remarkable photoelectric performance. Inspired by this, a solution crystallization method is employed to synthesize novel single crystals (SCs) of one dimensional (1D) (TMHD)SbBr₅. The dimensions of the chained (TMHD)SbBr₅ SC are 13 × 1.3 × 1.2 mm³ in size. The device based on a perovskite chain (TMHD)SbBr₅ exhibits unique anisotropic X-ray detection performance with a sensitivity of 62.8 and 30.5 µC Gy_air ^-1cm^-2 in the parallel and perpendicular orientations, respectively. It can lead to the directional movement of ions, resulting in large carrier mobility under the action of electric fields, and effectively increase the sensitivity to X-ray detection.