上海科技大学知识管理系统

Lead-free bismuth halogen perovskites have emerged as a promising candidate for high-performance X-ray detection, owing to their unique properties of bulk resistivity, significant X-ray absorption capabilities and diminished ion migration. Herein, using the facile low-temperature solution method, we obtained a large-size single crystal of (guanidinium)3Bi2Br9 (GBB), which adopts a zero-dimensional (0D) inorganic perovskite-like framework. The as-grown crystals show high resistivity (3.51×1012 Ω cm), low trap density (1.14×1010 cm−3) and large carrier mobility-lifetime product (μτ=1.13×10−3 cm2 V−1) under X-ray irradiation. Strikingly, the X-ray detectors fabricated on GBB single crystals exhibit notable performances including low dark current drift, high sensitivity of ~1645.7 μC Gyair−1 cm−2, and ultralow detection limit of ~0.85 nGyair s−1. This detection limit is among the lowest level for the reported 0D perovskite X-ray detectors. This study illuminates the prospective research into novel lead-free hybrid perovskites for the advancement of high-performance detectors of irradiation. © 2025 Wiley-VCH GmbH.