Figure 5
(a) Micromorphology of a PPV-Ru1 film dropcasted onto PET/ITO substrate. The inset depicts the cross-section image of PPV-Ru1 photocathodes. The black and white scale bar in panel (a) indicate 3 µm and 300 nm, respectively. (b) Fs-transient absorption spectra, (c) normalized kinetic traces recorded at different probe wavelength, and (d) decay-associated spectra (DAS) resulting from the global fit of the transient absorption data using a tri-exponential model. The grey spectra in panel (d) depict the absorption-difference spectra upon chemical reduction of Ru1 (at − 1.4 V vs. Ag|AgCl) in the PPV-Ru1 film. The absorption-difference spectra (Supplementary Fig. S10) are arbitrarily scaled to the figure.
