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J–V curves (a) and EQE (b) of the PSCs (ITO/PEDOT:PSS (25 nm)/absorber/PC61BM (60 nm)/ZnO-NP (60 nm)/Al (150 nm). Reference device: ITO (120 nm)/PEDOT/PCBM/ZnO-NP/Al (green). Reprinted with permission from ref (8). Copyright 2016 American Chemical Society.
