We examine the potential of a multijunction spectrum-splitting photovoltaic (PV) solar energy system with perovskite PV cells. Spectrum splitting allows combinations of different energy band gap PV cells that are laterally separated and avoids the complications of fabricating tandem stack architectures. Volume holographic optical elements have been shown to be effective for the spectrum-splitting operation and can be incorporated into compact module packages. However, one of the remaining issues for spectrum splitting systems is the availability of low-cost wide band gap and intermediate band gap cells that are required for realizing high overall conversion efficiency. Perovskite PV cells have been fabricated with a wide range of band gap energies that potentially satisfy the requirements for multijunction spectrum-splitting systems. A spectrum-splitting system is evaluated for a combination of perovskite PV cells with energy band gaps of 2.30, 1.63, and 1.25 eV and with conversion efficiencies of 10.4%, 21.6%, and 20.4%, respectively, which have been demonstrated experimentally in the literature. First, the design of a cascaded volume holographic lens for spectral separation in three spectral bands is presented. Second, a rigorous coupled wave model is developed for computing the diffraction efficiency of a cascaded hologram. The model accounts for cross-coupling between higher diffraction orders in the upper and lower holograms, which previous models have not accounted for but is included here with the experimental verification. Lastly, the optical losses in the system are analyzed and the hypothetical power conversion efficiency is calculated to be 26.7%.

中文翻译：

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具有钙钛矿光伏电池的横向光谱分裂系统

我们研究了具有钙钛矿光伏电池的多结光谱分裂光伏 (PV) 太阳能系统的潜力。光谱分裂允许组合横向分离的不同能带隙光伏电池，并避免制造串联堆叠架构的复杂性。体积全息光学元件已被证明对光谱分离操作有效，并且可以合并到紧凑的模块封装中。然而，频谱分裂系统的剩余问题之一是实现高整体转换效率所需的低成本宽带隙和中间带隙单元的可用性。钙钛矿光伏电池已被制造成具有广泛的带隙能量，可能满足多结光谱分裂系统的要求。对钙钛矿光伏电池组合的光谱分裂系统进行了评估，其能带隙为 2.30、1.63 和 1.25 eV，转换效率分别为 10.4%、21.6% 和 20.4%，已在文学。首先，介绍了用于在三个光谱带中进行光谱分离的级联体全息透镜的设计。其次，开发了一个严格的耦合波模型来计算级联全息图的衍射效率。该模型考虑了上下全息图中较高衍射级之间的交叉耦合，以前的模型没有考虑到，但这里包含在实验验证中。最后，分析了系统中的光损耗，计算出假设的功率转换效率为 26.7%。