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Relation between Fluorescence Quantum Yield and Open‐Circuit Voltage in Complete Perovskite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-02-17 , DOI: 10.1002/solr.201900554 Mariia Kramarenko 1 , Catarina G. Ferreira 1 , Guillermo Martínez-Denegri 1 , Constanza Sansierra 1 , Johann Toudert 1 , Jordi Martorell 1, 2
Solar RRL ( IF 6.0 ) Pub Date : 2020-02-17 , DOI: 10.1002/solr.201900554 Mariia Kramarenko 1 , Catarina G. Ferreira 1 , Guillermo Martínez-Denegri 1 , Constanza Sansierra 1 , Johann Toudert 1 , Jordi Martorell 1, 2
Affiliation
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Bringing the Voc of a perovskite solar cell toward its radiative value, corresponding to a 100% external fluorescence quantum yield (QY) of the cell, has been pursued to reach the highest performance photovoltaic devices. Therefore, much research has been focused on maximizing the QY of the active layer isolated from the rest of the cell layers. However, such quantity does not often correlate with the Voc following the ideal diode relation. Herein, the QYs of complete FA0.8MA0.2PbI3−yBry solar cells are reported, ranging from 0.1% to 3%, and compared with their Vocs, ranging from 1 to 1.13 V. By combining these measurements with electromagnetic simulations based on a full‐wavevector detailed balance and a fluorescence power‐loss model, it is demonstrated that a nonoptimal Voc in mixed‐cation lead halide perovskite cells is not only due to nonradiative photocarrier recombination at traps. In addition to the expected parasitic absorption of the emitted photons in the electrode layers, discrepancies appear between Voc and QY. These discrepancies are attributed to the rise of energy barriers, a side effect of trap removal. Indeed, although surface passivation may enhance the QY, its beneficial effect may be counterbalanced by the emergence of such barriers between active and charge‐transporting layers.
中文翻译：
完整钙钛矿太阳能电池的荧光量子产率与开路电压之间的关系
一直致力于将钙钛矿太阳能电池的V oc达到其辐射值，该值对应于电池的100％外部荧光量子产率（QY），以达到性能最高的光伏器件。因此，许多研究集中在最大化与其余细胞层隔离的活性层的QY上。然而，遵循理想二极管关系，该量通常不与V oc相关。在此，报告了完整的FA 0.8 MA 0.2 PbI 3- y Br y太阳能电池的QYs ，范围从0.1％到3％，并与它们的V oc进行了比较。s，范围为1至1.13V。通过将这些测量结果与基于全波矢量详细平衡和荧光功率损耗模型的电磁模拟相结合，证明混合阳离子卤化铅钙钛矿电池中的非最佳V oc并非如此。仅由于陷阱处的非辐射光载流子复合。除了预期的电极层中发射的光子的寄生吸收之外，V oc和QY之间还会出现差异。这些差异归因于能垒的增加，即势阱去除的副作用。确实，尽管表面钝化可以增强QY，但其有效作用可能会由于在有源层和电荷传输层之间出现这样的势垒而抵消。
更新日期：2020-02-17
中文翻译：
完整钙钛矿太阳能电池的荧光量子产率与开路电压之间的关系
一直致力于将钙钛矿太阳能电池的V oc达到其辐射值，该值对应于电池的100％外部荧光量子产率（QY），以达到性能最高的光伏器件。因此，许多研究集中在最大化与其余细胞层隔离的活性层的QY上。然而，遵循理想二极管关系，该量通常不与V oc相关。在此，报告了完整的FA 0.8 MA 0.2 PbI 3- y Br y太阳能电池的QYs ，范围从0.1％到3％，并与它们的V oc进行了比较。s，范围为1至1.13V。通过将这些测量结果与基于全波矢量详细平衡和荧光功率损耗模型的电磁模拟相结合，证明混合阳离子卤化铅钙钛矿电池中的非最佳V oc并非如此。仅由于陷阱处的非辐射光载流子复合。除了预期的电极层中发射的光子的寄生吸收之外，V oc和QY之间还会出现差异。这些差异归因于能垒的增加，即势阱去除的副作用。确实，尽管表面钝化可以增强QY，但其有效作用可能会由于在有源层和电荷传输层之间出现这样的势垒而抵消。
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