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The optical properties of a textured antireflective coating (ARC) polymeric film are engineered by combining the down‐conversion effect of large phosphor particles and the multiple scattering effect of SiO₂nanoparticles. In order to address the parasitic absorption of ultraviolet (UV) light, phosphors are added to convert UV light to visible light. However, the embedded phosphors increase the reflectance of the ARC film, due to the large particle size (>5 µm) and high refractive index (n ≈  1.9) of phosphors. Such a backward scattering problem of phosphors is compensated by adding spherical SiO₂nanoparticles. Experimental and computational results show that SiO₂nanoparticles in the ARC film decrease the reflectance by increasing the diffuse transmittance. This optically engineered ARC film successfully promotes the light absorption of the perovskite/silicon tandem solar cell, leading to the improvement of power conversion efficiency of the tandem cell from 22.48% to 23.50%.