Although perovskite solar cells (PSCs) have achieved encouraging efficiency, the photon loss at the substrate due to light reflection has not been well addressed. Light management is promising to reduce reflection loss and realize higher power conversion efficiency (PCE) of PSCs. Here, a bilayer antireflective coating (ARC) has been designed and coated onto the backside of the glass substrate of (FAPbI³)^x-(MAPbBr³)¹_^x PSCs to enhance photon harvesting and consequently the device efficiency. The bottom layer of the bilayer ARC is made from a silica polymer and the top layer is made from the mixture of hexamethyldisiloxane-modified mesoporous silica nanoparticles and a fluorinated silica polymer. By adjusting the refractive index and the film thickness of each layer according to a two-layer model, enhanced glass trans-mittance in a broadband wavelength range can be reached, with the maximum transmittance increasing from ca. 90% to over 95%. With the bilayer ARC, the maximum short-circuit current density and PCE of (FAPbI³)^x(MAPbBr³)^1-x PSCs can be increased from 25.5 mA cm^-2 and 22.7% to 26.5 mA cm^-2 and 23.9% with negligible changes in fill factor and open-circuit voltage. This work presents a simple yet effective strategy to enhance the efficiency of solar cells employing bilayer antirefective coatings, which can be applied to other types of solar cells.

尽管钙钛矿太阳能电池（PSC）取得了令人鼓舞的效率，但由于光反射而导致的基板光子损失尚未得到很好的解决。光管理有望减少反射损耗并实现PSC的更高功率转换效率（PCE）。这里，双层抗反射涂层（ARC）的设计和涂覆到（FAPbI的玻璃基板的背面³）^X - （MAPbBr ³）¹ _ ^XPSC可增强光子收集，从而提高设备效率。双层ARC的底层由二氧化硅聚合物制成，并且顶层由六甲基二硅氧烷改性的介孔二氧化硅纳米颗粒和氟化二氧化硅聚合物的混合物制成。通过根据两层模型调整每一层的折射率和膜厚，可以实现在宽带波长范围内增强的玻璃透射率，并且最大透射率从ca增大。90％到95％以上。使用双层ARC，（FAPbI ³）^x（MAPbBr ³）^{1- x} PSC的最大短路电流密度和PCE可以从25.5 mA cm ^-2和22.7％增加到26.5 mA cm^-2和23.9％，填充系数和开路电压的变化可忽略不计。这项工作提出了一种简单而有效的策略，以提高采用双层抗感染涂层的太阳能电池的效率，该涂层可以应用于其他类型的太阳能电池。