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Angular‐dependent spectral responsivity—Traceable measurements on optical losses in PV devices
Progress in Photovoltaics ( IF 6.7 ) Pub Date : 2017-11-27 , DOI: 10.1002/pip.2957
F. Plag 1 , I. Kröger 1 , T. Fey 1 , F. Witt 1 , S. Winter 1
Affiliation  

Angular‐dependent optical losses can have an effect on the spectral responsivity of photovoltaic devices. When these devices with differing angular‐dependent spectral responsivity are exposed to incident direct and diffuse solar spectral irradiance they will perform differently compared with direct and perpendicular beam exposure only. However, if the angular and polarization‐dependent spectral responsivity is known, optical losses can be determined for any given angular distributed solar spectrum. Here, we show the capabilities of a newly developed laser‐based calibration facility for traceable measurements on reference solar cells angular‐dependent spectral responsivity for device areas of up to 156 × 156 mm2. Our investigation is focused on a comprehensive analysis on all related measurement uncertainties. We present the results of measurements on a variety of reference solar cells as well as an industry type solar cell with and without encapsulation showing that strong differences in their optical properties occur. Additionally, we compare the results obtained with a conventional broadband characterization approach using a halogen lamp as light source. An agreement, better than 1%, was observed for the broadband measurement and the spectral measurements weighted by the spectral responsivity and the lamp spectrum. It is shown why different light sources lead to different angular‐dependent responsivities. In conclusion, validation measurements of solar simulator‐based or natural sunlight‐based angular responsivity facilities at testing and calibrations laboratories can be offered. Furthermore, by means of traceable angular‐dependent spectral responsivity measurements and multidimensional models under consideration of diffuse light components, optical losses for photovoltaic performance measurements, energy rating, and related uncertainties can be studied.

中文翻译:

取决于角度的光谱响应度—光伏设备中光损耗的可跟踪测量

取决于角度的光损耗可能会影响光伏设备的光谱响应度。当这些具有不同角度相关光谱响应度的设备暴露于入射的直接和漫射太阳光谱辐照度时,它们的性能将与仅直接和垂直光束辐照相比有所不同。但是,如果已知与角度和偏振有关的光谱响应度,则可以确定任何给定角度分布太阳光谱的光损耗。在这里,我们展示了一种新开发的基于激光的校准设备的功能,可对参考太阳能电池上与角度相关的光谱响应度进行跟踪测量,适用于最大面积为156×156 mm 2的器件。我们的研究集中在对所有相关测量不确定性的综合分析上。我们介绍了各种参考太阳能电池以及带有和不带有封装的工业类型太阳能电池的测量结果,这些结果表明它们的光学性能发生了巨大差异。此外,我们比较了使用卤素灯作为光源的常规宽带表征方法获得的结果。对于宽带测量和光谱测量,观察到的一致性好于1%,光谱测量由光谱响应度和灯光谱加权。这说明了为什么不同的光源会导致不同的角度依赖性响应度。综上所述,可以在测试和校准实验室提供基于太阳模拟器或基于自然阳光的角响应度设施的验证测量。此外,借助可追溯的角度相关光谱响应测量和考虑散射光分量的多维模型,可以研究光伏性能测量的光损耗,能量额定值以及相关的不确定性。
更新日期:2017-11-27
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