Lattice engineering for stabilized black FAPbI 3 perovskite single crystals for high-resolution x-ray imaging at the lowest dose.
Science advances(2023)
摘要
Preliminary theoretical analyses indicate that lattice relaxation may be used to release lattice strain in the FAPbI perovskite to warrant both high x-ray detection performance and improved stability. Herein, we demonstrate stable black α-phase FAPbI single crystals (SCs) realized by lattice engineering via annealing in the ambient atmosphere. The engineered α-FAPbI SC detector shows almost all the best figures of merit including a high sensitivity of 4.15 × 10 μC Gy cm, a low detection limit of 1.1 nGy s, a high resolution of 15.9 lp mm, and a short response time of 214 μs. We further demonstrate high-definition x-ray imaging at a dose rate below 10 nGy s on the FAPbI SC, indicating a minimal dose-area product of 0.048 mGy cm to the patient for one-time posteroanterior chest diagnosis, which is more than 3000 times lower than the international reference level of 150 mGy cm. In addition, the robust long-term stability enables the FAPbI SC x-ray detector to work steadily for more than 40 years.
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