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首页> 外文会议>Physics, simulation, and photonic engineering of photovoltaic devices III >Impact of Light Management on Photovoltaic Characteristics of GaAs Solar Cells with Photonic Crystals and Quasi-Photonic Crystals
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Impact of Light Management on Photovoltaic Characteristics of GaAs Solar Cells with Photonic Crystals and Quasi-Photonic Crystals

机译：光管理对带有光子晶体和准光子晶体的GaAs太阳能电池光伏特性的影响

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摘要

In detailed balance model, the efficiency of single-junction solar cells can be potentially as high as 33.5% under AM 1.5G illumination. However the best state-of-the-art devices are still far lower than those figures, even the electronic quality is nearly perfect. Therefore the efficiency gap should stem from the light management inside solar cells. Recently, external radiation efficiency (ηext) derived from detailed balance model is emphasized to evaluate light management and photon recycling, which aggregates the loss of backward emission into substrate and non-radiative recombination. This factor can be highly relevant to the cell's performance, especially open-circuit voltage (Voc), and maximizing Voc is generally considered as the last mile to approach ultra-high efficiency limit. In this work, we try to quantify the Voc enhancement in GaAs solar cells by enhancing light extraction. The simulation tools are RCWA simulation and photon recycling model NREL developed recently. The top structures we simulate here are TiO2 cones arranged in three PC/QPC lattices. After our calculation, the QPC 12-folds symmetry can make the biggest Voc enhancement 11.21meV compared with bare one, and the structure also possess extraordinary omni-directional anti-reflection ability for maintaining high Jsc. Our results also show that using this way to enhance Voc is especially suitable for cells with ordinary material quality. Therefore, the requests of ideal top structures for solar cells' use are not only near-perfect anti-reflection, but the ability to maximize light extraction if no feature of angular filter exists.
机译：在详细的平衡模型中，在AM 1.5G照明下，单结太阳能电池的效率可能高达33.5％。然而，最好的最新设备仍然远远低于那些数字，即使电子质量也几乎是完美的。因此，效率差距应源于太阳能电池内部的光管理。近年来，人们强调了从详细的平衡模型得出的外部辐射效率（ηext），以评估光管理和光子回收利用，这将向后发射到基板中的损失和非辐射复合聚集在一起。这个因素可能与电池的性能高度相关，尤其是开路电压（Voc），并且最大化Voc通常被视为接近超高效率极限的最后一英里。在这项工作中，我们尝试通过增强光提取来量化GaAs太阳能电池中Voc的增强。仿真工具是RCWA仿真和最近开发的NREL光子回收模型。我们在此模拟的顶部结构是排列在三个PC / QPC晶格中的TiO2锥体。经过我们的计算，QPC的12倍对称性可以使Voc的增强比裸露的最大11.21meV，并且该结构还具有非凡的全向抗反射能力，可以保持较高的Jsc。我们的结果还表明，使用这种方法增强Voc特别适用于具有普通材料质量的电池。因此，对于太阳能电池使用的理想顶部结构的要求不仅是近乎完美的抗反射性，而且还要求在不存在角滤光片特征的情况下具有最大化光提取的能力。

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