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首页> 美国卫生研究院文献>Scientific Reports >Large area Germanium Tin nanometer optical film coatings on highly flexible aluminum substrates
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Large area Germanium Tin nanometer optical film coatings on highly flexible aluminum substrates

机译：高柔性铝基板上的大面积锗锡纳米光学薄膜涂层

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摘要

Germanium Tin (GeSn) films have drawn great interest for their visible and near-infrared optoelectronics properties. Here, we demonstrate large area Germanium Tin nanometer thin films grown on highly flexible aluminum foil substrates using low-temperature molecular beam epitaxy (MBE). Ultra-thin (10–180 nm) GeSn film-coated aluminum foils display a wide color spectra with an absorption wavelength ranging from 400–1800 nm due to its strong optical interference effect. The light absorption ratio for nanometer GeSn/Al foil heterostructures can be enhanced up to 85%. Moreover, the structure exhibits excellent mechanical flexibility and can be cut or bent into many shapes, which facilitates a wide range of flexible photonics. Micro-Raman studies reveal a large tensile strain change with GeSn thickness, which arises from lattice deformations. In particular, nano-sized Sn-enriched GeSn dots appeared in the GeSn coatings that had a thickness greater than 50 nm, which induced an additional light absorption depression around 13.89 μm wavelength. These findings are promising for practical flexible photovoltaic and photodetector applications ranging from the visible to near-infrared wavelengths.
机译：锗锡（GeSn）薄膜因其可见光和近红外光电子特性而引起了极大的兴趣。在这里，我们演示了使用低温分子束外延（MBE）在高柔性铝箔基板上生长的大面积锗锡纳米薄膜。 GeSn薄膜超薄（10-180 nm）涂层的铝箔由于其强大的光学干涉效应，显示了宽光谱，吸收波长范围为400-1800 nm。纳米GeSn / Al箔异质结构的吸光率可提高至85％。而且，该结构表现出优异的机械柔韧性并且可以被切割或弯曲成许多形状，这有利于广泛的柔性光子学。显微拉曼研究显示，随着晶格厚度的增加，拉伸应变会发生较大变化，这是由晶格变形引起的。尤其是，纳米锡富集的GeSn点出现在厚度大于50μm的GeSn涂层中，这引起了在13.89μm波长附近的光吸收下降。这些发现对于从可见光到近红外波长的实际柔性光伏和光电探测器应用是有前途的。

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