Recently, perovskite solar cell is considered as one of the most efficient photovoltaic cell because of their high efficiency and long-term stability. In this paper, we show the influence of scaffold layer composed of size-controlled SiO₂ nanoparticles (NPs) on perovskite solar cells. The infiltration of perovskite into the scaffold layer depended strongly on the size of the SiO₂ NPs. We investigated the effects of scaffold layers comprised of SiO₂ NPs that were 15, 30, 50, 70, and 100 nm in diameter on the properties of perovskite films. 50nm diameter SiO₂ NPs scaffold based perovskite solar cells exhibited a current density (J_sc) of 16.4 mA cm^-2 , a open-circuit voltage (V_oc) of 1.05 V, and a power-conversion efficiency (PCE) of 11.45%, which show a considerable advancement compared with perovskite solar cell based on TiO₂ scaffold layer, where J_sc = 17.3 mA cm^-2 , V_oc = 0.94 V, and the PCE was 10.29%.