Figure 3. (a) Diagram illustrates the formation of the PC70BM domain through spinodal demixing. Reproduced from [89]. (b) The Flory-Huggins theory was used to calculate the phase diagram of PS:PC70BM:o-xylene. Reproduced from [89]. (c) Aggregate absorption spectra were recorded for a PCE11 film after spin-coating at both 70°C and 22°C, with normalization at 1.94 eV. Reproduced from [94].(d) The morphology-forming process for films made of polymer:nonfullerene small molecules and polymer:nonfullerene small molecule:polymer blends is schematically depicted. Reproduced from [96].(e) Absorption patterns of seq-blade cast films in two dimensions. Reproduced from [90]. (f) Relative rate of aggregation for PBDB-T and FOIC. Reproduced from [90]. (g) Corresponding 1D GIWAXS line profiles. Reproduced from [98]. (h) 2D GIWAXS data of PM6:Y6 blend films. Reproduced from [98].