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Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements

机译:通过绝对电致发光效率测量来全面诊断多结太阳能电池中的子电池

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摘要

World-wide studies on multi-junction (tandem) solar cells have led to record-breaking improvements in conversion efficiencies year after year. To obtain detailed and proper feedback for solar-cell design and fabrication, it is necessary to establish standard methods for diagnosing subcells in fabricated tandem devices. Here, we propose a potential standard method to quantify the detailed subcell properties of multi-junction solar cells based on absolute measurements of electroluminescence (EL) external quantum efficiency in addition to the conventional solar-cell external-quantum-efficiency measurements. We demonstrate that the absolute-EL-quantum-efficiency measurements provide I–V relations of individual subcells without the need for referencing measured I–V data, which is in stark contrast to previous works. Moreover, our measurements quantify the absolute rates of junction loss, non-radiative loss, radiative loss, and luminescence coupling in the subcells, which constitute the “balance sheets” of tandem solar cells.
机译:对多结(串联)太阳能电池的全球研究导致转换效率逐年创纪录地提高。为了获得有关太阳能电池设计和制造的详细而适当的反馈,有必要建立诊断串联制造设备中子电池的标准方法。在这里,我们提出了一种潜在的标准方法,除了常规的太阳能电池外部量子效率测量之外,还基于电致发光(EL)外部量子效率的绝对测量来量化多结太阳能电池的详细子电池性能。我们证明,绝对EL量子效率的测量结果提供了各个子电池的I–V关系,而无需引用测量的I–V数据,这与以前的工作形成了鲜明的对比。此外,我们的测量结果量化了构成串联太阳能电池“资产负债表”的子电池中的结点损耗,非辐射损耗,辐射损耗和发光耦合的绝对速率。

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