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首页> 外文期刊>Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion >Optimized short-circuit current mismatch in multi-junction solar cells
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Optimized short-circuit current mismatch in multi-junction solar cells

机译：优化了多结太阳能电池中的短路电流失配

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摘要

Multi-junction photovoltaic devices include two or more component sub-cells which are electrically interconnected in series. At any power point, the current output of the total device is limited by the sub-cell with the smallest current density. Therefore, the maximum efficiency is reached when the sub-cells have equal current densities at their respective maximum power points. In this case the sub-cells are so called "power matched". We report an experimental procedure in which the current-voltage characteristics of tandem solar cells can be measured under various irradiance spectra, i.e. under various short-circuit current matching conditions. This permits the probing of the optimized short circuit current mismatch, where the sub-cells are power matched, which is essential to define design rules for the tandem stack. The method applies well to devices where one of the sub-cells is metastable. We show that, in the case of thin-film silicon tandem cells, the optimum mismatch changes significantly after light induced degradation. Consequently, the degradation factor of such devices is shown to depend not only on material quality but also on the initial short circuit current matching. This experiment also provides relative quantification of the fill factors of each sub-cell. Our example suggests that a high bottom cell deposition rate can be detrimental to the fill factor of the top cell in the case of thin-film silicon tandem cells deposited in superstrate configuration.
机译：多结光伏器件包括两个或多个串联电互连的子电池。在任何功率点，整个设备的电流输出都受到电流密度最小的子电池的限制。因此，当子电池在其各自的最大功率点处具有相等的电流密度时，可以达到最大效率。在这种情况下，子电池被称为“功率匹配”。我们报告了一种实验程序，其中可以在各种辐照光谱下（即在各种短路电流匹配条件下）测量串联太阳能电池的电流-电压特性。这允许探测优化的短路电流失配，其中子电池功率匹配，这对于定义串联堆叠的设计规则至关重要。该方法很好地适用于其中子单元之一是亚稳态的设备。我们表明，在薄膜硅串联电池的情况下，最佳失配在光诱导降解后会发生明显变化。因此，这种设备的退化因子显示不仅取决于材料质量，而且还取决于初始短路电流匹配。该实验还提供了每个子电池填充因子的相对定量。我们的示例表明，在以叠层结构沉积薄膜硅串联电池的情况下，较高的底部电池沉积速率可能会损害顶部电池的填充因子。

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