Perovskite–silicon tandem solar cells offer the possibility of overcoming the power conversion efficiency limit of conventional silicon solar cells. Various textured tandem devices have been presented aiming at improved optical performance, but optimizing film growth on surface-textured wafers remains challenging. Here we present perovskite–silicon tandem solar cells with periodic nanotextures that offer various advantages without compromising the material quality of solution-processed perovskite layers. We show a reduction in reflection losses in comparison to planar tandems, with the new devices being less sensitive to deviations from optimum layer thicknesses. The nanotextures also enable a greatly increased fabrication yield from 50% to 95%. Moreover, the open-circuit voltage is improved by 15 mV due to the enhanced optoelectronic properties of the perovskite top cell. Our optically advanced rear reflector with a dielectric buffer layer results in reduced parasitic absorption at near-infrared wavelengths. As a result, we demonstrate a certified power conversion efficiency of 29.80%.

钙钛矿-硅串联太阳能电池提供了克服传统硅太阳能电池的功率转换效率限制的可能性。已经提出了旨在提高光学性能的各种纹理串联设备，但优化表面纹理晶圆上的薄膜生长仍然具有挑战性。在这里，我们展示了具有周期性纳米纹理的钙钛矿-硅串联太阳能电池，这些太阳能电池在不影响溶液处理的钙钛矿层的材料质量的情况下具有各种优势。与平面串联相比，我们展示了反射损耗的减少，新设备对最佳层厚度的偏差不太敏感。纳米纹理还使制造产量从 50% 大大提高到 95%。而且，由于钙钛矿顶部电池的光电特性增强，开路电压提高了 15 mV。我们具有介电缓冲层的先进光学后反射器可减少近红外波长的寄生吸收。因此，我们展示了 29.80% 的认证电源转换效率。