Silicene/Silicene Oxide Nanosheets for Broadband Photodetectors
Silicene/Silicene Oxide Nanosheets for Broadband Photodetectors
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DOI：
10.1021/acsanm.2c00337
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发表时间：
2022-03-25
影响因子：
5.9
通讯作者：
Cui, Jingbiao
中科院分区：
文献类型：
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作者：
Gonzalez-Rodriguez, Roberto;del Castillo, Roxana M.;Cui, Jingbiao
硅烯纳米片是一种由硅原子组成的二维材料，由于其独特的性质，在下一代电子和光电器件中具有巨大的应用潜力。然而，硅烯纳米片的大规模生产及其降解中的问题仍然对这些应用提出了挑战。在这里，我们报告了一种从二硅化钙（CaSi 2）中获得大量单层至多层厚硅烯/氧化硅烯（“Si纳米片”）的方法。我们还表明，硅烯纳米片在空气中经历氧化，并在储存12周后高度氧化。进行了密度泛函理论研究，并提供了这种氧化的详细了解。硅烯/硅烯氧化物纳米片的光电探测器设备也首次制造。它们在可见光谱范围内显示出宽带响应，具有出色的响应率（14.3 A/W），探测率（3 x 10（10）（）Jones）和外部量子效率（44.6%），展示了这种材料在光电器件中的应用前景。
Nanosheets of silicene, a 2D material made of silicon atoms, have great potential for use in next-generation electronic and optoelectronic devices due to their unique properties. However, issues in the large-scale production of silicene nanosheets and in their degradation still present challenges for these applications. Here, we report a method to obtain large quantities of single to few-layer thick silicene/silicene oxide ("Si nanosheets") from calcium disilicide (CaSi2). We also show that the silicene nanosheets experience oxidation in air and are highly oxidized after 12 weeks of storage. Density functional theory studies were performed and provide a detailed understanding of this oxidation. Silicene/ silicene oxide nanosheet-based photodetector devices were also fabricated for the first time. They show a broadband response in the visible spectral range with outstanding responsivity (14.3 A/W), detectivity (3 x 10(10)( )Jones), and external quantum efficiency (44.6%), demonstrating the promising applications of this material for optoelectronic devices.