High-Quality Single Crystal Perovskite for Highly Sensitive X-Ray Detector

Organolead halide perovskites provide tremendous opportunities for ideal radiation detection due to their high atomic numbers, large carrier mobilities, and long lifetimes. Here, we synthesized high-quality single crystal CH ₃ NH ₃ PbBr ₃ with a high mobility-lifetime product of 4.1 × 10 ^-2 cm ² /V by the developed inverse low temperature crystallization method. The sensitive X-ray detector was fabricated by depositing 50 nm of gold on both sides of the perovskite crystal. This device exhibited a high sensitivity up to 259.9 μC/Gyair/cm ² under the 39 keV X-ray exposure at a small electric field of ~0.83 V/mm and yielded a low noise of 3.1 × 10 ^-23 A ² /Hz. Additionally, the sensitivity can be further improved by increasing operating voltage. Our results provided a solution for constructing high-performance X-ray detectors.