Advanced optics for perovskite-silicon tandem solar cells

钙钛矿-硅叠层太阳能电池具有以成本有效的方式克服纯硅太阳能电池的基本效率限制的潜力。然而，目前的光损耗显著限制了这种电池的实际效率。因此，钙钛矿-硅叠层太阳能电池（OPoSiT）项目的主要目标是优化这种叠层电池的光学性能。该项目的目标如下1。最大化进入系统的光耦合2.增加钙钛矿顶部太阳能电池3中的高能光子的吸收。增加硅底部电池中具有较低能量的光子的吸收（具有低寄生吸收）将硅太阳能电池的短路电流增加至少1.5mA/cm 2这些目标将通过实现（i）在正面上的有效的钙钛矿结构，（ii）通过在钙钛矿太阳能电池上以及在硅和钙钛矿太阳能电池之间的高度透明的接触，以及（iii）通过在硅太阳能电池的背面处的非常有效的光捕获结构来实现。对于所有概念来说，不仅要考虑光学性能，还要考虑电气性能以及与整个工艺流程的兼容性，这一点至关重要。

Perovskite-silicon tandem solar cells have the potential to overcome the fundamental efficiency limitation of pure silicon solar cells in a cost-effective way. However, currently optical losses limit the practical efficiency of such cells significantly. Therefore, the main goal of the project Advanced optics for perovskite-silicon tandem solar cells (OPoSiT) is the optimization of the optical performance of such tandem cells. The goals of the project are the following 1. Maximization of the light coupling into the system 2. Increasing the absorption of high-energy photons in the perovskite top solar cell 3. Increasing the absorption of photons with lower energy in the silicon bottom cell (with low parasitic absorption) 4. Increasing the short-circuit current of the silicon solar cell by at least 1.5 mA/cm2 These goals will be reached by implementing (i) an effective antireflection structure on the front side, (ii) by highly transparent contact on the perovskite solar cell and between the silicon and perovskite solar cell and (iii) by a very effective light-trapping structure at the rear of the silicon solar cell. For all concepts it is crucial that not only the optical but also the electrical performance and the compatibility with the full process sequence are taken into account.