This paper reports the optimization of perovskite solar cell (PSC) devices with a triple-graded active layer by using a numerical simulation approach to achieve a better power conversion efficiency (PCE). An optoelectrical model is applied to achieve excellent light trapping by combining perovskite absorbing layers (PALs) with certain bandgap values, namely 1.6 eV, 1.7 eV, and 1.8 eV, for improved photogeneration. The optimized device structure exhibits an optimized short-circuit current density (J SC ) of 20.05 mA/cm 2 and open-circuit voltage (V OC ) of 1.1 V, with an average fill factor (FF) of 86% and maximum PCE approaching 19%. Furthermore, the highest external quantum efficiency (EQE), with an average of 82%, was also achieved because of the improved optical characteristics of the PSC device, particularly in the visible spectrum range. Owing to the greatly improved short-circuit current density, the double carrier-transport materials with triple PAL stack effectively enhances the device performance parameters, as well as opening an avenue for future developments and device optimization.