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Broadband absorption enhancement in metal nanomaterials for high-performance organic solar cells (OSCs) is highly desirable in the plasmonic-enhanced OSCs.Here, a new dual plasmonic device is proposed by strategically designing device structures and managing two types of plasmonic structures (e.g., metal grating and metal nanoparticles (NPs)) in one device to achieve the broadband enhancement around the wavelength of 350-800 nm due to multiple plasmonic effects.As a result, the maximum power conversion efficiency (PCE) of 9.62% has been achieved from the device, which is one of the highest efficiencies in plasmonic OSCs reported for a single junction OSC.This work demonstrates the significance of rational design of the device structure and plasmonic nanostructures in achieving high-performance plasmonic OSCs with broadband plasmonic absorption enhancement.