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Enhancement of photocatalytic activity of a two-dimensional GeH/graphene heterobilayer under visible light

机译:可见光下二维GeH /石墨烯异质双层的光催化活性增强

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摘要

Searching for novel photocatalysts is one of the most important topics in photocatalytic fields. For this purpose, in the present work, the structural, electronic, and optical properties of GeH as well as a GeH/graphene heterointerface are studied based on hybrid density functional calculations including the nonlocal van der Waals correction. Our results show that the strain-engineered GeH monolayer captures a broad range of the solar spectrum. Moreover, photogenerated electron-hole pairs can be efficiently separated in the GeH/graphene heterojunction by formation of a Schottky barrier. Comparing to a pure GeH monolayer, the hybrid GeH/graphene complex displays an enhanced optical absorption in the visible region, suggesting powerful potential in energy and environmental applications.
机译:在光催化领域中,寻找新型光催化剂是最重要的主题之一。为此,在当前工作中,基于包括非局部范德华校正在内的混合密度函数计算,研究了GeH的结构,电子和光学性质以及GeH /石墨烯异质界面。我们的结果表明,应变工程GeH单层捕获了广泛的太阳光谱。此外,通过形成肖特基势垒,可以在GeH /石墨烯异质结中有效地分离光生电子-空穴对。与纯GeH单层相比,杂化GeH /石墨烯复合物在可见光区域显示出增强的光吸收,表明在能源和环境应用中具有强大潜力。

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