Figure 21.

(a) Grazing-incidence wide-angle X-ray scattering pattern of the printed CsPb(I_0.77Br_0.23)₃ thin film sample obtained on heating and then subsequent cooling runs. Red lines indicate the phase transitions. Temperature–composition phase diagram of the CsPb(I_1–xBr_x)₃ system obtained on (b) heating and (c) subsequent cooling. Symmetry notation: C - cubic, T - tetragonal, O - orthorhombic. Green data points in (c) are taken from ref (388). Reprinted (adapted) with permission from ref (384). Copyright 2020 The Royal Society of Chemistry.