The UV–vis-NIR Broadband Ultrafast Flexible Sn-Pb Perovskite Photodetector for Multispectral Imaging to Distinguish Substance and Foreign-Body in Biological Tissues

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Abstract

Multispectral imaging plays an important role in many applications such as color recognition, substance distinction, and medical therapy. Although multicolor detection has been demonstrated in lead-based perovskites, the limited near-infrared responsivity and slow response impede their applications for identifying the substance. Herein, narrow bandgap highly stable Cs0.05MA0.45FA0.5Sn0.5Pb0.5I3 (Sn-Pb) perovskite films with excellent crystallinity and selective growth orientation are realized by the synergy of a Sn-Pb mixing method and electronegativity balance. The Sn-Pb perovskite photodetector shows a broadband response from 350 to 1000 nm and high-performance near-infrared (NIR) detection with a fast response of 2.0 µs and excellent responsivity of 0.29 A W−1. Furthermore, flexible Sn-Pb perovskite devices without any encapsulation in the air continuously exhibit fast response after 3000 bending cycles. In addition, the Sn-Pb perovskite diffuse reflection imaging system is demonstrated for multispectral imaging and substance distinction. Meanwhile, foreign-body identification in biological tissues by NIR imaging of Sn-Pb perovskite photodetectors is further demonstrated, proving narrow bandgap mixed perovskite photodetectors an attractive candidate for biomedical imaging.

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Li, W., Chen, J., Lin, H., Zhou, S., Yan, G., Zhao, Z., … Mai, W. (2024). The UV–vis-NIR Broadband Ultrafast Flexible Sn-Pb Perovskite Photodetector for Multispectral Imaging to Distinguish Substance and Foreign-Body in Biological Tissues. Advanced Optical Materials, 12(2). https://doi.org/10.1002/adom.202301373

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