All-perovskite tandem solar cells have great potential to realize the efficiency beyond the Shockley–Queisser efficiency limitation of single junction solar cells. Here we investigate the photon redistribution effect induced by introduction of the optical coupling layer in two terminal (2 T) tandem solar cells. In this work, it is shown that the introduction of the optical coupling layer could not only reduce the reflection loss, but also would affect the redistribution of the absorbed photons in the tandem device due to the optical interference effect, which will disturb the previous balance and complicate the optical modulation. This photon redistribution phenomenon is systemically investigated by combining the optical and electrical aspects. By considering the coupling effect beyond the antireflection function after introducing the optical coupling layer, the new current match could be achieved, which would obviously improve the device performance further. Various materials such as LiF, MgF2, Al2O3, ZnO have been adopted as the optical coupling layer and it is demonstrated that this phenomenon is universal for all the cases. The improvement brought by photon redistribution effect may be even more obvious than antireflection function. Through analyzing the inner optical mechanism and modulating the structure, a higher performance can be achieved by carefully considering the optical coupling effect.

中文翻译：

---

通过超越抗反射功能的光耦合层提高两端全钙钛矿串联太阳能电池的性能

全钙钛矿串联太阳能电池具有实现超越单结太阳能电池的肖克利-奎瑟效率限制的巨大潜力。在这里，我们研究了在两端 (2 T) 串联太阳能电池中引入光耦合层引起的光子重新分布效应。在这项工作中表明，光耦合层的引入不仅可以减少反射损耗，而且由于光干涉效应会影响串联器件中吸收的光子的重新分布，从而扰乱先前的平衡并使光调制复杂化。通过结合光学和电学方面，系统地研究了这种光子重新分布现象。通过考虑引入光耦合层后超出抗反射功能的耦合效应，可以实现新的电流匹配，这将明显进一步提高器件性能。各种材料如 LiF、MgF2、Al2O3、ZnO 已被用作光耦合层，并且证明这种现象在所有情况下都是普遍的。光子重分布效应带来的改善可能比抗反射功能更明显。通过分析内部光学机制和调制结构，仔细考虑光耦合效应可以实现更高的性能。ZnO 已被用作光耦合层，并且证明这种现象在所有情况下都是普遍的。光子重分布效应带来的改善可能比抗反射功能更明显。通过分析内部光学机制和调制结构，仔细考虑光耦合效应可以实现更高的性能。ZnO 已被用作光耦合层，并且证明这种现象在所有情况下都是普遍的。光子重分布效应带来的改善可能比抗反射功能更明显。通过分析内部光学机制和调制结构，仔细考虑光耦合效应可以实现更高的性能。