Current leakage and fill factor in multi-junction solar cells linked via absolute electroluminescence characterization
Current leakage and fill factor in multi-junction solar cells linked via absolute electroluminescence characterization
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DOI：
10.1109/pvsc.2016.7749812
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Lin Zhu;M. Yoshita;Tetsuya Nakamura;T. Mochizuki;Changsu Kim;M. Imaizumi;Y. Kanemitsu;H. Akiyama
中科院分区：
文献类型：
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作者：
Lin Zhu;M. Yoshita;Tetsuya Nakamura;T. Mochizuki;Changsu Kim;M. Imaizumi;Y. Kanemitsu;H. Akiyama
通过结合绝对电致发光（EL）强度和EL成像测量，在GaInP/GaAs 2结太阳能电池中证明了漏电流特征和填充因子之间的直接联系。在低注入水平下，子电池外部辐射效率的下降在同一批次中制造的太阳能电池之间显示出很大的差异，这导致在光照下的电池的填充因子（FF）和性能的差异。绝对EL图像清楚地显示，GaAs子电池中的电流泄漏而不是较高的非辐射复合率导致其在低注入电流和较低FF下的ηext的显著退化。除了MJ太阳能电池中各个子电池的开路电压之外，绝对EL还提供了诊断FF的强大方法。
Direct link between current-leakage features and fill factors was demonstrated in GaInP/GaAs 2-junction solar cells via combining measurements of absolute electroluminescence (EL) intensity and EL imaging. The drops of subcell external radiative efficiency under low injection level have shown large differences among the solar cells fabricated in the same batch, which lead to the difference in the fill factor (FF) and performance of the cells under illumination. The absolute EL images clearly revealed that a current leakage, instead of higher non-radiative recombination rates, in the GaAs-subcell caused the significant degradation in its ηext at low injection current and in the lower FF. The absolute EL provides a powerful way to diagnose FF in addition to open-circuit voltage of individual subcells in MJ solar cells.