Broadband enhancement of SiO2@TiO2 light-trapping nanostructure for improving the efficiency of perovskite solar cells

High-efficiency perovskite solar cells (PSCs) are one of the promising candidates to solve the energy crisis worldwide. Optical loss is one of the factors limiting the efficiency of PSCs and antireflection layers provide a dependable method for improving the efficiency of PSCs. Here, a design and optimization of PSCs with a SiO2@TiO2 nanoparticles (NPs) antireflection layer is systematically studied by COMSOL Multiphysics. The effect of different shell-thickness ratios (STRs) on the average light absorption and short-circuit current density of PSCs is simulated and compared with that of planar PSCs. The results show that the average light absorption of PSCs with SiO2@TiO2 NPs of 0.08 STR is 83.21%, which is 5.17% higher than that of PSCs with SiO2 NPs and 10.11% higher than that of planar PSCs. Our results provide theoretical guidance for using SiO2@TiO2 NPs as antireflection layers in the fabrication of PSCs.