Fig. 2: Lifetime analysis of the 64 compositions for mixed-cation lead iodide perovskites.
a The colormap of T80 lifetime for the 64 perovskites aged in climate chambers preset at 85 °C (top) and 140 °C (middle) with 10% RH in the dark, and under 120 mW cm−2 metal-halide light illumination with N2 flow at 60 °C (bottom). b The ranking of feature importance using GBT regression and SHAP assessment, showing the impact of each cation and processing condition in descending order of importance (rank). The purple and orange color indicates low and high values of a given feature, respectively. Note that aging_temp., dep_method, Ost, α−δ indicates aging temperature, deposition method (drop-cast = 1), over-stoichiometric with excess iodide (OSt), the probability of phase transition in humid air (>30%RH), respectively. c The correlation plot of T80 at 85 °C against T80 at 85 °C, 100 °C, and 140 °C. Linear fitting was used to fit all the statistical data to obtain the Pearson correlation coefficients. d The correlation plot of T80 under light illumination against T80 aged at 85 °C, 100 °C, and 140 °C. e \(k_{{\mathrm{dec}}}\)-1000/T plot of No. 49 (MA0.08Rb0.02FA0.9PbI3) and No. 63 (Cs0.15MA0.05FA0.9PbI3). The data are fitted using Eq. (2), indicated by blue and red lines. f \(k_{{\mathrm{dec}}}\)-1000/T plot of MAPbI3 and FAPbI3. g, h T80 lifetime versus ageing temperature for a series of CsxMAyFA1-x-yPbI3 perovskites, with x + y = 15% (g) and x + y = 20% (h).
