Plasmonic Au nanoparticles for enhanced broadband light absorption in inverted organic photovoltaic devices by plasma assisted physical vapour deposition

► We obtained broadband light absorption enhancement (BLAE) by Au nanoparticles (NPs). ► Plasma assisted PVD Au NPs reached to the active layer via the hole transport layer. ► No enhanced light absorption was obtained when PAPVD Au NPs was directly applied on the active layer. ► A 50-90% increase in power conversion efficiency was achieved due to BLAE.