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首页> 外文会议>IEEE Photovoltaic Specialists Conference >Predicted Performance of High-Efficiency Photovoltaics with Energy-Selective Front Reflectors for Photon Recycling Enhancements
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Predicted Performance of High-Efficiency Photovoltaics with Energy-Selective Front Reflectors for Photon Recycling Enhancements

机译：带有能量选择前反射镜的高效光伏的预测性能，可增强光子回收率

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摘要

Energy-selective mirrors that reflect photons below a specific energy, e.g. radiatively emitted photons from the cell at the cell bandgap, back towards the solar cell enhance solar cell efficiencies via photon recycling by generating higher open-circuit voltages. The internal front reflectors are designed to admit sunlight for photogeneration at all energies above a given threshold energy above the bandgap energy, while remaining highly reflective for energies at or near the solar cell bandgap. Predicted cell performance is modeled using detailed balance and semi-empirical methods to determine optimal reflector energies for maximum cell efficiency enhancements and effects non-radiative recombination on efficiency. Improved open circuit voltages are predicted at the highest front reflectance values with energies 0.25 eV above that of the cell bandgap. For Si cells, increases of up to 2% in maximum cell efficiency corresponding to Voc increase of 0.2 V can be achieved in single-junction solar cells approaching 33% when combined with appropriate front reflector architectures such as Bragg reflectors or dielectric stacks that restrict black body emission. For GaAs cells, up to 9% can be gained with angle emission restriction.
机译：能量选择反射镜反射低于特定能量的光子，例如在单元带隙处从单元发出的辐射光子，再返回到太阳能电池，通过产生更高的开路电压，通过光子回收提高了太阳能电池的效率。内部前反射器设计为在高于带隙能量的给定阈值能量以上的所有能量下，允许太阳光用于光生，同时对于太阳能电池带隙或附近的能量保持高反射率。使用详细的平衡和半经验方法对预测的电池性能进行建模，以确定最佳的反射器能量，以最大程度地提高电池效率并影响非辐射重组对效率的影响。在最高的正面反射率值处预测的开路电压将得到改善，其能量比电池带隙的能量高0.25 eV。对于硅电池，对应于V的最大电池效率提高了2％ oc 当与适当的前反射器体系结构（例如限制黑体发射的布拉格反射器或电介质堆栈）组合使用时，单结太阳能电池可将0.2 V的电压提高到接近33％。对于GaAs电池，在角度发射限制条件下可获得高达9％的电流。

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