Tailoring Nucleation Dynamics in Perovskite Single Crystal for High-Sensitivity X-Ray Detection and Imaging

In this research, we present a nucleation modulation strategy that incorporates bromoacetic acid to regulate the nucleation and growth of MAPbBr_2.94Cl_0.06 perovskite, effectively minimizing defects and facilitating high-quality single crystals with minimal time expenditure. As a result, the X-ray detector based on the optimized perovskite achieved an record high X-ray sensitivity of 5.4 × 10⁴ μC Gy_air^-1 cm^-2 among planar MAPbBr₃ devices and a detection limit as low as 17.8 nGy_air s^-1, which is ascribed to effectively reduced dark current and 2.2 times higher carrier mobility-life time products than the control sample. This result highlights the potential of achieving high-performance perovskite X-ray detectors via time-saving and facile strategies on nucleation dynamics.