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https://onlineli brary.wiley.com/doi/epdf/10.1002/solr.202200948
In single-junction perovskite/silicon tandem solar cells , it is important to know which subcells limit the total current to accommodate the perovskite absorber thickness and band gap. Current matching is typically analyzed by integrating the measured external quantum efficiency. However, this approach can lead to significant errors and misunderstandings when metastable perovskite solar cells are involved. Here, spectral characterization is an alternative method to avoid these errors. Current-voltage curves under different spectral conditions were recorded. The spectrum irradiance settings vary in a systematic manner from the red-shifted spectrum of the AM1.5G spectrum (perovskite top solar cell limits current) to the blue-shifted spectrum (silicon bottom solar cell limits current). This method not only accurately determines the current matching point, but also provides a quantitative understanding of the behavior of individual subunits and their impact on tandem performance. Since different current mismatches also affect other global cell parameters, an example is given where when the silicon solar cell limits the current, the current loss due to the current mismatch is partially compensated by a strong fill factor increase, resulting in high power output also under AM1.5G conditions.
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