The power conversion efficiency of the market‐dominating silicon photovoltaics approaches its theoretical limit. Bifacial solar operation with harvesting additional light impinging on the module back and the perovskite/silicon tandem device architecture are among the most promising approaches for further increasing the energy yield from a limited area. Herein, the energy output of perovskite/silicon tandem solar cells in monofacial and bifacial operation is calculated, for the first time considering luminescent coupling (LC) between two sub‐cells. For energy yield calculations, idealized solar cells are studied at both standard testing as well as realistic weather conditions in combination with a detailed illumination model for periodic solar panel arrays. Typical experimental photoluminescent quantum yield values reveal that more than 50% of excess electron–hole pairs in the perovskite top cell can be utilized by the silicon bottom cell by means of LC. As a result, LC strongly relaxes the constraints on the top‐cell bandgap in monolithic tandem devices. In combination with bifacial operation, the optimum perovskite bandgap shifts from 1.71 eV to the range 1.60–1.65 eV, where already high‐quality perovskite materials exist. The results are very important for developing optimal perovskite materials for tandem solar cells.

中文翻译：

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钙钛矿/硅串联太阳能电池：发光耦合和双面性的影响。

市场主导的硅光伏发电的功率转换效率接近其理论极限。双面太阳能操作以及收集入射在模块背面的额外光以及钙钛矿/硅串联设备架构是在有限区域内进一步提高能量产量的最有前途的方法之一。在此，首次计算了钙钛矿/硅串联太阳能电池在单面和双面运行中的能量输出，这是首次考虑了两个子电池之间的发光耦合（LC）。对于能量产量的计算，结合标准的定期太阳能电池板阵列的详细照明模型，在标准测试以及实际天气条件下研究了理想化的太阳能电池。典型的实验光致发光量子产率值表明，钙钛矿顶部电池中超过50％的过量电子-空穴对可通过LC被硅底部电池利用。结果，LC极大地放宽了单片串联器件中对顶层电池带隙的限制。与双面操作相结合，最佳的钙钛矿带隙从1.71 eV转变为1.60–1.65 eV，这时已经存在高质量的钙钛矿材料。结果对于开发用于串联太阳能电池的最佳钙钛矿材料非常重要。最佳的钙钛矿带隙从1.71 eV改变到1.60–1.65 eV的范围，那里已经存在高质量的钙钛矿材料。结果对于开发用于串联太阳能电池的最佳钙钛矿材料非常重要。最佳的钙钛矿带隙从1.71 eV改变到1.60–1.65 eV的范围，那里已经存在高质量的钙钛矿材料。结果对于开发用于串联太阳能电池的最佳钙钛矿材料非常重要。