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While many studies have found that the power conversion efficiency of OSCs is improved by inserting metal nanoparticles into the OSCs, little has been reported on the use of size-and shape-controlled metal nanoparticles for fine-tuning the optical properties.Here, we investigate the dependence of silver nanoparticles' size and shape, at various concentrations, on the power conversion efficiency of OSCs[1].Also, we propose a metal-metal core-shell nanocube (NC)as an advanced plasmonic material for highly efficient organic solar cells (OSCs).We covered an Au core with a thin Ag shell as a scattering enhancer to build Au@Ag NCs, showing stronger scattering efficiency than Au nanoparticles (AuNPs) throughout the visible range.Highly efficient plasmonic organic solar cells were fabricated by embedding Au@Ag NCs into an anodic buffer layer,poly(3,4-ethylenedioxythiophene)∶poly(styrenesulfonate) (PEDOT∶PSS)[2, 3].