Non-uniformity is a relevant concern of concentrator photovoltaic systems (CPV) due to its impact on the performance of multi-junction (MJ) solar cells. This work is focused on a state-of-the-art investigation related to the effects of shading on the irradiance profiles and electrical performance of MJ cells. For doing this, three different CPV single-units with a concentration of ≈559x have been experimentally investigated indoors at the CPV laboratory of the University of Jaén. The units are made up of poly(methyl methacrylate) (PMMA) Fresnel lens and standard GaInP/GaInAs/Ge MJ cells. Also, single-lens-optical element (SILO-Pyramid) and refractive truncated pyramid (RTP) homogenizers have been considered. The results indicate that shading produces additional spatial and spectral non-uniformities, and that these are reduced by the use of homogenizers. In addition, the non-uniform spectral illumination has been identified as the main cause of the additional reduction of the performance of MJ solar cells. In this sense, the SILO-Pyramid provides the best results and shows a significantly stable spectral performance under shading conditions. For a no-homogenizer case, the maximum power shows a reduction of 86.3% for a shading factor of 80%, while it is only reduced by 83.2% and by 81.6%, respectively, for the RTP and SILO-Pyramid.

非均匀性是聚光光伏系统 (CPV) 的一个相关问题，因为它会影响多结 (MJ) 太阳能电池的性能。这项工作的重点是与阴影对 MJ 电池的辐照度分布和电气性能的影响相关的最新研究。为此，哈恩大学 CPV 实验室在室内对浓度为 ≈559x 的三种不同 CPV 单体进行了实验研究。这些单元由聚甲基丙烯酸甲酯 (PMMA) 菲涅耳透镜和标准 GaInP/GaInAs/Ge MJ 电池组成。此外，还考虑了单透镜光学元件 (SILO-Pyramid) 和折射截棱锥 (RTP) 均化器。结果表明，阴影会产生额外的空间和光谱非均匀性，并且这些都可以通过使用均质器来减少。此外，非均匀光谱照明已被确定为 MJ 太阳能电池性能额外降低的主要原因。从这个意义上说，SILO-Pyramid 提供了最好的结果，并在阴影条件下显示出非常稳定的光谱性能。对于没有均质器的情况，最大功率在 80% 的遮光系数下降低了 86.3%，而对于 RTP 和 SILO-Pyramid，仅分别降低了 83.2% 和 81.6%。