Oxide perovskite Ba₂AgIO₆ wafers for X-ray detection

Abstract

X-ray detection is of great significance in biomedical, nondestructive, and scientific research. Lead halide perovskites have recently emerged as one of the most promising materials for direct X-ray detection. However, the lead toxicity remains a worrisome concern for further commercial application. Great efforts have been made to search for lead-free perovskites with similar optoelectronic properties. Here, we present a lead-free oxide double perovskite material Ba₂AgIO₆ for X-ray detection. The lead-free, all-inorganic nature, as well as the high density of Ba₂AgIO₆, promises excellent prospects in X-ray applications. By employing the hydrothermal method, we successfully synthesized highly crystalline Ba₂AgIO₆ powder with pure phase. Furthermore, we prepared Ba₂AgIO₆ wafers through isostatic pressure and built X-ray detectors with Au/Ba₂AgIO₆ wafer/Au photoconductive structure. The as-prepared X-ray detectors showed a sensitivity of 18.9 μC/(Gy_air·cm²) at 5 V/mm, similar to commercial α-Se detectors showcasing their advantages for X-ray detection.

Graphical abstract

Keywords

oxide double perovskite / lead-free / X-ray detection

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Acknowledgements

This work was financially supported by the National Postdoctoral Program for Innovative Talent (No. BX20200142), the National Natural Science Foundation of China (Grant Nos. 61725401, 5171101030, and 51761145048), the National Key R&D Program of China (Nos. 2016YFB0700702, 2016YFA0204000, and 2016YFB0201204), the HUST Key Innovation Team for Interdisciplinary Promotion (No. 2016JCTD111), and China Postdoctoral Science Foundation (Nos. 2020M62004075 and 2020M62005089). The authors from HUST thank the Analytical and Testing Center of HUST and the facility support of the Center for Nanoscale Characterization and Devices, WNLO. We also thank Prof. Guangzu Zhang for providing the isostatic pressing machine.

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