Fig. 3: Phase diagrams at different photocarrier densities.
From: Unified theory for light-induced halide segregation in mixed halide perovskites
a–e Phase diagrams in the dark of the different compounds in the temperature window 150–350 K. f–t Phase diagrams for photocarrier densities n = 10−9, 10−7, and 10−5 per formula unit. Red lines: spinodals separating the metastable (grey) and unstable (pink) regions. Full blue and green lines: binodals separating the stable (white) and metastable regions, with the blue (green) lines indicating the compositional (light-induced) binodals. When entering the metastable region by crossing the compositional (light-induced) binodals, nucleation of a phase with a Br concentration indicated by the dashed blue (green) lines becomes favourable. The dots indicate the possible coexistence of three phases: the parent phase (black dots) and two types of nucleated phases with different Br concentration (blue and green dots).
