The sensitive detection of low-dose X-ray radiation is essential to many X-ray applications. In this article, the ultrasensitive X-ray detector based on pure Cs₂AgBiBr₆ all-inorganic lead-free perovskite film is successfully demonstrated and encapsulated using a metal casing with a Be window. The high-quality Cs₂AgBiBr₆ films are obtained through the low-cost solution process with long electron–hole diffusion length (~700 nm) and long carrier lifetime (~750 ns). Benefiting from the excellent properties of the Cs₂AgBiBr₆ film and the stable ambient provided by the packaging module, the resulting device exhibits attractive X-ray detection capabilities with a minimum detectable dose rate of 145.2 ${\mathrm {nGy}}_{air}\text{s}^{-1}$ and a detection sensitivity up to $1.8\times 10^{4}\,\,\mu {\mathrm {CGy}}_{air}{}^{-1}$ cm⁻², which is about a thousand times higher than the sensitivity achieved with commercial a-Se X-ray detectors. Besides, the encapsulated device maintains superior detection performance after 2 months of storage, indicating the favorable reliability of the encapsulated device. This article demonstrates a possibility to use Cs₂ AgBiBr₆ perovskite film and Be window for the sensitive X-ray detection, which will inspire further development of radiation electronics by utilizing all-inorganic lead-free perovskite.

中文翻译：

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由具有高灵敏度和低检测限的全无机无铅钙钛矿薄膜启用的封装 X 射线探测器

低剂量 X 射线辐射的灵敏检测对于许多 X 射线应用至关重要。在本文中，基于纯 Cs ₂ AgBiBr ₆全无机无铅钙钛矿薄膜的超灵敏 X 射线探测器成功演示并使用带有 Be 窗口的金属外壳进行封装。高质量的 Cs ₂ AgBiBr ₆薄膜是通过低成本的溶液工艺获得的，具有长电子-空穴扩散长度（~700 nm）和长载流子寿命（~750 ns）。受益于 Cs ₂ AgBiBr ₆的优异性能 薄膜和封装模块提供的稳定环境，由此产生的设备表现出有吸引力的 X 射线检测能力，最小可检测剂量率为 145.2 ${\mathrm {nGy}}_{air}\text{s}^{-1}$ 和检测灵敏度高达 $1.8\times 10^{4}\,\,\mu {\mathrm {CGy}}_{air}{}^{-1}$ cm ^-2，这比使用商用 a-Se X 射线探测器实现的灵敏度高约一千倍。此外，封装器件在存放2个月后仍保持优异的检测性能，表明封装器件具有良好的可靠性。本文展示了使用 Cs ₂ AgBiBr ₆钙钛矿薄膜和 Be 窗口进行灵敏 X 射线检测的可能性，这将通过利用全无机无铅钙钛矿激发辐射电子学的进一步发展。