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首页> 外文会议>Next generation (nano) photonic and cell technologies for solar energy conversion >Mimicking moth's eyes for photovoltaic applications with tapered GaP nanorods
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Mimicking moth's eyes for photovoltaic applications with tapered GaP nanorods

机译：锥形GaP纳米棒模仿光伏应用的蛾眼

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摘要

We demonstrate experimentally that ensembles of conically shaped GaP nanorods form layers of graded refractive index due to the increased filling fraction of GaP from the top to the bottom of the layer. Graded refractive index layers reduce the reflection and increase the coupling of light into the substrate, leading to broadband and omnidirectional antireflection surfaces. This reduced reflection is the result of matching the refractive index at the interface between the substrate and air by the graded index layer. The layers can be modeled using a transfer-matrix method for isotropic layered media. We show theoretically that the light coupling efficiency into silicon can be higher than 95% over a broad wavelength range and for angles up to 60° by employing a layer with a refractive index that increases parabolically. Broadband and omnidirectional antireflection layers are specially interesting for enhancing harvesting of light in photovoltaics.
机译：我们通过实验证明，由于GaP填充层从顶部到底部的填充比例增加，圆锥形GaP纳米棒的整体形成了渐变折射率的层。渐变折射率层可减少反射并增加光到基板中的耦合，从而形成宽带和全向抗反射表面。这种减少的反射是通过渐变折射率层使基板和空气之间的界面处的折射率匹配的结果。可以使用转移矩阵方法对各向同性分层介质进行建模。我们从理论上证明，通过使用折射率抛物线增加的层，进入硅的光耦合效率可以在宽波长范围内以及高达60°的角度下高于95％。宽带和全向减反射层对于增强光伏中光的收集特别有趣。

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