Halide perovskites have shown great potential for X-ray detection in medical imaging and product inspection applications. However, the ion migration in perovskites causes large noise and baseline drift, deteriorating the X-ray detection and imaging performance. Here we adopt the atmosphere-controlled edge-defined film-fed growth (EFG) method to grow high-quality shape-controlled CsPbBr₃ single crystals (SCs) in an Ar and HBr mixed atmosphere. Compared with the vertical Bridgman (VB)-CsPbBr₃ SCs, the EFG-CsPbBr₃ SCs show a much lower trap density, a higher resistivity (1.61 × 10¹⁰ Ω cm) and a larger ion migration activation energy (0.378 eV), decreasing the leakage current and baseline drift. An X-ray detector based on EFG-CsPbBr₃ SCs hence exhibits outstanding balanced performance, with a negligible dark-current drift of 1.68 × 10⁻⁹ μA cm⁻¹ s⁻¹ V⁻¹, an incredibly low detection limit of 10.81 nGy_air s⁻¹ and a sensitivity of 46,180 μC Gy_air⁻¹ cm⁻² under a high electric field of 5,000 V cm⁻¹. Furthermore, the detector maintains a stable response for 30 days. Our work provides an effective strategy to improve lead-halide perovskite SCs for high-performance X-ray detection and imaging.

卤化物钙钛矿在医学成像和产品检测应用中的 X 射线检测方面显示出巨大的潜力。然而，钙钛矿中的离子迁移会导致较大的噪声和基线漂移，从而降低X射线检测和成像性能。在这里，我们采用气氛控制边缘限定薄膜馈送生长（EFG）方法在Ar和HBr混合气氛中生长高质量形状控制的CsPbBr ₃单晶（SC）。与垂直Bridgman (VB)-CsPbBr ₃ SCs相比，EFG-CsPbBr ₃ SCs表现出更低的陷阱密度、更高的电阻率(1.61 × 10 ¹⁰ Ω cm)和更大的离子迁移激活能(0.378 eV)，降低了漏电流和基线漂移。因此，基于 EFG-CsPbBr ₃ SC 的 X 射线探测器表现出出色的平衡性能，暗电流漂移可忽略不计，为 1.68 × 10 ^-9 μA cm ^-1 s ^-1 V ^-1 ，检测限极低，为 10.81 nGy _air s ^-1 ，在5,000 V cm ^-1的高电场下灵敏度为46,180 μC Gy _air ^-1 cm ^-2 。此外，探测器可保持30天的稳定响应。我们的工作提供了一种有效的策略来改进卤化铅钙钛矿 SCs 以实现高性能 X 射线检测和成像。