Extended Data Fig. 9: Vertical phase-separation morphology of the PEDOT:PSS_PFI composite film.
From: High-efficiency stretchable light-emitting polymers from thermally activated delayed fluorescence
(a) Molecular depth (with the step size of ~5 nm) profiles of PEDOT:PSS_PFI composite film as inferred from the XPS results in Supplementary Figs. 36 and 37. Deconvoluted S 2p peaks for PEDOT (164.5 eV), sulfonic acid (S 2p peaks at 168.4 and 168.9 eV), C 1 s peak at 291.6 eV, and F 1 s peak for the PFI concentration were used. This shows that the PFI is rich at both top and bottom surfaces in the composite film, and the molecular concentration of PFI gradually decreased toward the centre in the thickness direction. (b) Proposed 3D illustration of the morphology of the PEDOT:PSS_PFI composite film.
