Fig. 4: Assessment of the stability of the organic/inorganic interface.
From: Non-fullerene acceptor organic photovoltaics with intrinsic operational lifetimes over 30 years
UV-Vis absorption spectra plotted vs. aging time under ultraviolet illumination with intensity equivalent to 60 suns of thin film of a PCE-10 on ZnO, b BT-CIC on ZnO, c BT-CIC on ZnO with an IC-SAM buffer, and d PCE-10:BT-CIC on ZnO with an IC-SAM buffer. X-ray photoelectron spectra of Mo 3d for the fresh device without e 2 nm C70 layer, f aged device without C70 layer, g fresh device with C70 layer, and h aged device with C70 layer. The Gaussian distributions used to fit the spectrum and the sum of these Gaussians are shown by the solid lines. The black lines, which are often buried by the summation fit (green lines), correspond to the experimental results.
