In this study, we present a two-dimensional numerical analysis of thinfilm CIGS solar cells enhanced with surface-integrated metallic nanorods. Employing ANSYS Lumerical’s FDTD and CHARGE solvers, we evaluated the optical and electrical characteristics of cells with copper (Cu), gold (Au), and silver (Ag) nanorods relative to an un-patterned baseline. The device structure comprises an Al emitter (cathode), a ZnO transparent conducting oxide layer, a CdS buffer layer, a CIGS absorber layer, and an Al back contact (anode). The simulations demonstrate that plasmonic light scattering from the nanorods significantly enhances optical absorption and charge collection. Specifically, Cu nanorods outperformed all other designs, yielding a short-circuit current density of 17.4 mA/cm² and a power conversion efficiency of 17.8%, compared to baseline values of 7.2 mA/cm² and 7.4%. Consequently, surface-integrated plasmonic nanostructures demonstrate strong potential for advancing thin-film solar energy conversion.