Al-Zoubi Omar H, Said Tarek M, Alher Murtadha Abdulmueen, El-Ghazaly Samir, Naseem Hameed
Opt Express. 2015 Jul 27;23(15):A767-78. doi: 10.1364/OE.23.00A767.
In this study we report novel silicon nanowire (SiNW) array structures that have near-unity absorption spectrum. The design of the new SiNW arrays is based on radial diversity of nanowires with periodic diamond-like array (DLA) structures. Different array structures are studied with a focus on two array structures: limited and broad diversity DLA structures. Numerical electromagnetic modeling is used to study the light-array interaction and to compute the optical properties of SiNW arrays. The proposed arrays show superior performance over other types of SiNW arrays. Significant enhancement of the array absorption is achieved over the entire solar spectrum of interest with significant reduction of the amount of material. The arrays show performance independent of angle of incidence up to 70 degrees, and polarization. The proposed arrays achieved ultimate efficiency as high as 39% with filling fraction as low as 19%.
在本研究中，我们报告了具有近单位吸收光谱的新型硅纳米线（SiNW）阵列结构。新型SiNW阵列的设计基于具有周期性类金刚石阵列（DLA）结构的纳米线的径向多样性。研究了不同的阵列结构，重点关注两种阵列结构：有限和广泛多样性的DLA结构。使用数值电磁建模来研究光与阵列的相互作用，并计算SiNW阵列的光学特性。所提出的阵列显示出优于其他类型SiNW阵列的性能。在感兴趣的整个太阳光谱范围内实现了阵列吸收的显著增强，同时材料用量显著减少。这些阵列在入射角高达70度和偏振情况下表现出与角度无关的性能。所提出的阵列在填充率低至19%时实现了高达39%的极限效率。
