Heterointerface Design of Perovskite Single Crystals for High-Performance X-Ray Imaging.
basic_science · Level V
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- Record sourced from PubMed, PMID 37878999.
- Also identified by DOI 10.1002/adma.202305513.
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Abstract
Metal halide perovskite single crystals (MHP-SCs) are known for their facile fabrication into large sizes using inexpensive solution methods. Owing to their combination of large mobility-lifetime products and strong X-ray absorption, they are considered promising materials for efficient X-ray detection. However, they suffer from large dark currents and severe ion migration, which limit their sensitivity and stability in critical X-ray detection applications. Herein, a heterointerface design is proposed to reduce both the dark current and ion migration by forming a heterojunction. In addition, the carrier transport performance is significantly improved using heterointerface engineering by designing a gradient band structure in the SCs. The SC heterojunction detectors exhibit a high sensitivity of 3.98 × 10<sup>5</sup> µC Gy<sub>air</sub> <sup>-1</sup> cm<sup>-2</sup> with a low detection limit of 12.2 nGy<sub>air</sub> s<sup>-1</sup> and a high spatial resolution of 10.2 lp mm<sup>-1</sup> during imaging. These values are among the highest reported for state-of-the-art MHP X-ray detectors. Moreover, the detectors show excellent stability under continuous X-ray irradiation and maintainclear X-ray imaging after 240 d. This study provides novel insights into the design and fabrication of X-ray detectors with high detection efficiency and stability, which are beneficial for developing inexpensive, high-resolution X-ray imaging equipment.