Mixed low-dimensional metal halide perovskite single crystal for low-detection-limit x-ray detection via oriented ion migration

Low-dimensional metal halide perovskites exhibit exceptional photoelectronic properties and intrinsic stability, positioning them as a promising class of semiconductor materials for light-emitting devices and photodetectors. In this work, we present a millimeter-scale single crystal of mixed low-dimensional (one-dimensional-zero-dimensional [1D-0D]) organic lead iodide with well-defined crystallinity. The fabricated single-crystal devices demonstrate high-sensitivity photoresponse and x-ray detection performance. By spatially isolating organic molecules to form the mixed 1D-0D crystal structure, ion migrations is effectively suppressed, resulting in a remarkable three orders of magnitude reduction in the dark current (56.4 pA @200 V) of the single-crystal devices. Furthermore, by enhancing the background characteristics, we achieved an impressive low x-ray detection limit of 154.5 nGys-1 in the single-crystal device. These findings highlight that the mixed 1D-0D organic lead iodide configuration efficiently controls ion migration within the crystal structure, offering a promising avenue for realizing high-performance perovskite-based photodetectors and x-ray detectors.image We report a new mixed low-dimensional (1D-0D) organolead halide perovskite single crystal with a size of 5 mm and well-defined crystallinity, showing unique polarized photoluminescence and oriented ion migration behavior. Based on the 1D-0D crystal, we have successfully obtained a high-sensitivity x-ray detector with an ultra-low detection limit of 152.5 nGyair s-1. The results shown here provides a greatly competitive strategy for high-performance x-ray detectors. image