Advanced materials are critical for enhancing the efficiency of solar absorbers. Hence, the present study looks at the unique interaction between graphene and perovskite materials, a combination that has the potential to change the landscape of solar energy harvesting. The Graphene–Perovskite Integrated Solar Absorber (GPISA) structure harvests more than 98 % in UV and VIS regions ranging from 200 nm and goes up to 4000 nm of the solar spectrum using the Finite Element Method (FEM). Not only does it boast a broader absorption range from 200 to 4000 nm, covering virtually the entire solar spectrum, but it also achieves an impressive average absorption of 95.50 %. Additionally, the comprehensive analysis of its performance, encompasses optimized parameterization, exhaustive mapping of electric and magnetic field intensities, and in-depth investigation of both transverse magnetic (TM) and transverse electric (TE) field behaviors. This correlates to a weighted absorption rate of more than 97 % in the AM1.5 solar spectrum, as well as endurance to varied incoming angles (0°–80°) without considerable absorption loss, making it suitable for real-world direct sunlight absorptance. The GPISA is significantly more cost-effective due to its 3240 nm thickness. Overall, GPISA's exceptional combination of broad absorption, high efficiency, and compact design firmly positions it as a frontrunner in the advancement of efficient, high-performance solar energy harvesting. GPISA has efficient uses in solar induction systems as well as solar air, water heating, and other industrial heating applications.