fig3

Figure 3. (A) Schematic device structure; (B) J-V curves for best-performing devices before and after DMF passivation under one solar (100 mW cm^-2) light; (C) EQE spectra and integrated current densities for best-performing devices before and after DMF passivation; (D) Dark current curves; (E) Mott-Schottky curves; (F) Tafel curves. BCP: 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline; PCBM: [6,6]-Phenyl C71 butyric acid methyl ester; PVK: poly(9-vinylcarbazole); DMF: N,N-dimethylformamide; ITO: indium tin oxide; PCE: photoelectric conversion efficiency; EQE: external quantum efficiency.