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We successfully synthesized AuAg-alloyed nanoprisms (AuAgNPrisms) through the seed mediated and galvanic replacement approaches. By introducing the synthesized AuAgNPrisms at the buffer/active interface with an optimal concentration, we increased the power conversion efficiency of PTB7:PC70BM-based organic photovoltaic cells from 6.58% to 7.11%, the current density from 13.36 to 15.01 mA/cm2, corresponding...