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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >A review on plasma-assisted VLS synthesis of silicon nanowires and radial junction solar cells
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A review on plasma-assisted VLS synthesis of silicon nanowires and radial junction solar cells

机译：硅纳米线和径向结太阳能电池的等离子体辅助VLS合成研究进展

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摘要

Incorporation of nanostructures is a recent trend in the photovoltaic community, aimed at improving light absorption and consequently cell efficiency. In this regard, semiconductor nanowires provide an attractive research platform for a new generation of cost-effective and efficient solar cells. Thanks to their unique geometry, silicon nanowires enhance light trapping and anti-reflection effects by means of multiple scattering between individual nanowires, and by coupling the light into confined eigenmodes over a broad range of the solar spectrum. Moreover, radial junction solar cells built around nanowires decouple the light absorption and carrier collection directions, which allows for a higher internal field and better carrier collection. Thus, arrays of radial junction solar cells bring advantages of high efficiency with reduced material amount. This is particularly attractive for devices based on hydrogenated amorphous and microcrystalline silicon thin films. In this paper, after reviewing different approaches to fabricate silicon nanowires, we focus on nanowires grown using the plasma-assisted vapour-liquid-solid method because of the simplicity and compatibility with current silicon thin-film technology. Their application to a-Si:H based radial junction solar cells has already resulted in ~8% of stable devices with an absorber layer thickness of only 100 nm. Moreover, current challenges and perspectives such as the use of a microcrystalline silicon absorber are also reviewed.
机译：纳米结构的结合是光伏界最近的趋势，旨在改善光吸收从而改善电池效率。在这方面，半导体纳米线为新一代的经济高效的太阳能电池提供了一个有吸引力的研究平台。由于其独特的几何形状，硅纳米线通过各个纳米线之间的多次散射，以及将光耦合到太阳光谱的宽范围内的受限本征模中，从而增强了光捕获和抗反射效果。此外，围绕纳米线构建的径向结太阳能电池使光吸收方向和载流子收集方向解耦，这允许更高的内部电场和更好的载流子收集。因此，径向结太阳能电池的阵列带来了效率高且材料量减少的优点。这对于基于氢化非晶和微晶硅薄膜的器件特别有吸引力。在本文中，在回顾了制造硅纳米线的不同方法之后，由于与当前硅薄膜技术的简单性和兼容性，我们将重点放在使用等离子辅助气液固方法生长的纳米线上。它们在基于a-Si：H的径向结太阳能电池中的应用已经产生了约8％的稳定器件，吸收层厚度仅为100 nm。此外，还回顾了当前的挑战和观点，例如使用微晶硅吸收剂。

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