Fofang N T, Luk T S, Okandan M, Nielson G N, Brener I
Center for Integrated Nanotechnologies, Sandia National Laboratory, Albuquerque, New Mexico 87185, USA.
Opt Express. 2013 Feb 25;21(4):4774-82. doi: 10.1364/OE.21.004774.
Enhanced light trapping is an attractive technique for improving the efficiency of thin film silicon solar cells. In this paper, we use FDTD simulations to study the scattering properties of silicon nanostructures on a silicon substrate and their application as enhanced light trappers. We find that the scattered spectrum and angular scattering distribution strongly depend on the excitation direction, that is, from air to substrate or from substrate to air. At the dipole resonance wavelength the scattering angles tend to be very narrow compared to those of silicon nanostructures in the absence of a substrate. Based on these properties, we propose a new thin film silicon solar cell design incorporating silicon nanostructures on both the front and back surfaces for enhanced light trapping.
增强光捕获是提高薄膜硅太阳能电池效率的一种有吸引力的技术。在本文中，我们使用时域有限差分（FDTD）模拟来研究硅衬底上硅纳米结构的散射特性及其作为增强光捕获器的应用。我们发现，散射光谱和角散射分布强烈依赖于激发方向，即从空气到衬底或从衬底到空气。在偶极共振波长处，与没有衬底时的硅纳米结构相比，散射角往往非常窄。基于这些特性，我们提出了一种新的薄膜硅太阳能电池设计，在其正面和背面都结合硅纳米结构以增强光捕获。
