Issue 11, 2025

Highly stable bismuth-chloride perovskite X-ray direct detectors with an ultralow detection limit

Abstract

The quest for highly sensitive and stable X-ray detectors has intensified, driven by diverse applications such as medical diagnostics and industrial inspection. Recent strides have been made in harnessing the potential of lead halide perovskites for radiation detection, thanks to their remarkable optoelectronic properties. However, the toxicity of Pb and intrinsic material instability restrict their practical applications as next-generation efficient detectors. Here, we have developed environment-friendly three-dimensional (3D) bismuth-chloride perovskites designed for highly sensitive and stable X-ray direct detection. By the introduction of monovalent Na+, one-dimensional (1D) Cs3Bi2Cl9 can be converted into high-quality 3D double perovskite Cs2NaBiCl6 characterized by excellent photophysical properties. Our investigation, combining X-ray photoelectron spectroscopy and temperature-dependent photoluminescence, reveals a modulated electronic dimension and a mitigated electron–phonon coupling effect in Cs2NaBiCl6. As such, the 3D Cs2NaBiCl6-based direct detectors achieve a high sensitivity of 354.5 μC Gy−1 cm−2 and an ultralow detection limit of 59.4 nGy s−1, with continuous on–off switching for 4500 s. Overall, our work provides a new direction for designing and developing lead-free perovskites to achieve highly sensitive X-ray detection with exceptional stability.

Graphical abstract: Highly stable bismuth-chloride perovskite X-ray direct detectors with an ultralow detection limit

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Article information

Article type
Edge Article
Submitted
04 Jan 2025
Accepted
01 Feb 2025
First published
13 Feb 2025
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2025,16, 4768-4774

Highly stable bismuth-chloride perovskite X-ray direct detectors with an ultralow detection limit

H. Chen, Q. Han, H. Qin, Y. Shen, H. Lv, Y. Liu, L. Du, Y. Wang, Y. He and W. Ning, Chem. Sci., 2025, 16, 4768 DOI: 10.1039/D5SC00061K

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