In this study, we successfully synthesized high-quality 2D layered BiOI crystals using a novel space-confined molten salt method. These crystals exhibit a bandgap of 1.9 eV, closely aligning with theoretical expectations. The photodetectors fabricated from these BiOI nanosheets demonstrate exceptional ultraviolet (UV) detection capabilities. Key performance metrics include an ultrahigh photoresponsivity of 1048 mA W⁻¹, an impressive external quantum efficiency of 420%, and a significant detectivity of 4.7 × 10¹² Jones, coupled with a fast response time of 420/690 μs at 310 nm. This study not only highlights the potential of BiOI in UV photodetectors but also marks a substantial advancement in the development of high-performance bismuth-based semiconductor optoelectronic devices.

中文翻译：

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用于高灵敏度紫外光电检测的大面积高质量二维 BiOI 的合成

在这项研究中，我们利用新型空间受限熔盐方法成功合成了高质量的二维层状 BiOI 晶体。这些晶体的带隙为 1.9 eV，与理论预期非常吻合。由这些 BiOI 纳米片制成的光电探测器表现出卓越的紫外线 (UV) 探测能力。关键性能指标包括 1048 mA W ^{−1的超高光响应度、令人印象深刻的 420% 的外部量子效率、4.7 × 10 12} Jones的显着探测率，以及 310 nm 处 420/690 μs 的快速响应时间。这项研究不仅凸显了BiOI在紫外光电探测器中的潜力，而且标志着高性能铋基半导体光电器件的发展取得了实质性进展。