Schuster Christian S, Bozzola Angelo, Andreani Lucio C, Krauss Thomas F
Opt Express. 2014 Mar 10;22 Suppl 2:A542-51. doi: 10.1364/OE.22.00A542.
We propose a new figure of merit to assess the performance of light trapping nanostructures for solar cells, which we call the light trapping efficiency (LTE). The LTE has a target value of unity to represent the performance of an ideal Lambertian scatterer, although this is not an absolute limit but rather a benchmark value. Since the LTE aims to assess the nanostructure itself, it is, in principle, independent of the material, fabrication method or technology used. We use the LTE to compare numerous proposals in the literature and to identify the most promising light trapping strategies. We find that different types of photonic structures allow approaching the Lambertian limit, which shows that the light trapping problem can be approached from multiple directions. The LTE of theoretical structures significantly exceeds that of experimental structures, which highlights the need for theoretical descriptions to be more comprehensive and to take all relevant electro-optic effects into account.
我们提出了一种新的品质因数，用于评估太阳能电池光捕获纳米结构的性能，我们将其称为光捕获效率（LTE）。LTE的目标值为1，以代表理想朗伯散射体的性能，尽管这不是绝对极限，而是一个基准值。由于LTE旨在评估纳米结构本身，原则上它与所使用的材料、制造方法或技术无关。我们使用LTE来比较文献中的众多提议，并确定最有前景的光捕获策略。我们发现不同类型的光子结构都能接近朗伯极限，这表明光捕获问题可以从多个方向来解决。理论结构的LTE显著超过实验结构的LTE，这突出了理论描述需要更全面并考虑所有相关电光效应的必要性。
