This study examines the effect of cheap and easy to synthesize copper nanoparticles (CuNPs) for its surface plasmon resonance behavior on the performance of organic solar cells (OSC). A simple synthesis of stable CuNPs is reported together with a procedure for their optimized incorporation in the OSC architecture via dispersing them on ZnO interfacial layer. The CuNPs triggers the localized surface plasmon resonance resulting in enhancement of short circuit current density under AM1.5 illumination.