Leyre Sven, Cappelle Jan, Durinck Guy, Abass Aimi, Hofkens Johan, Deconinck Geert, Hanselaer Peter
Opt Express. 2014 May 5;22 Suppl 3:A765-78. doi: 10.1364/OE.22.00A765.
To enhance the efficiency of solar cells, a luminescent down shifting layer can be applied in order to adapt the solar spectrum to the spectral internal quantum efficiency of the semiconductor. Optimization of such luminescent down shifting layers benefits from quick and direct evaluation methods. In this paper, the potential of the adding-doubling method is investigated to simulate the optical behavior of an encapsulated solar cell including a planar luminescent down shifting layer. The results of the adding-doubling method are compared with traditional Monte Carlo ray tracing simulations. The average relative deviation is found to be less than 1.5% for the absorptance in the active layer and the reflectance from the encapsulated cell, while the computation time can be decreased with a factor 52. Furthermore, the adding-doubling method is adopted to investigate the suitability of the SrB4O7:5%Sm2 + ,5%Eu2 + phosphor as a luminescent down shifting material in combination with a Copper Indium Gallium Selenide solar cell. A maximum increase of 9.0% in the short-circuit current can be expected if precautions are taken to reduce the scattering by matching the refractive index of host material to the phosphor particles. To be useful as luminescent down shifting material, the minimal value of the quantum yield of the phosphor is determined to be 0.64.
为提高太阳能电池的效率，可以应用发光向下转换层，以使太阳光谱适应半导体的光谱内量子效率。此类发光向下转换层的优化受益于快速且直接的评估方法。本文研究了倍加方法在模拟包含平面发光向下转换层的封装太阳能电池光学行为方面的潜力。将倍加方法的结果与传统的蒙特卡罗光线追踪模拟进行了比较。发现对于有源层的吸收率和封装电池的反射率，平均相对偏差小于1.5%，而计算时间可减少52倍。此外，采用倍加方法研究了SrB4O7:5%Sm2 + ,5%Eu2 + 荧光粉作为发光向下转换材料与铜铟镓硒太阳能电池结合的适用性。如果采取措施通过使主体材料的折射率与荧光粉颗粒匹配来减少散射，则短路电流有望最大增加9.0%。为用作发光向下转换材料，确定荧光粉量子产率的最小值为0.64。
