Surface stabilized cubic phase of CsPbI3 and CsPbBr3 at room temperature
Size and temperature dependent phase diagrams of CsPbI3 and CsPbBr3. Phase diagrams of (a) 0-dimensional, (b) 1-dimensional, and (c) 2-dimensional CsPbI3, and of (d) 0-dimensional, (e) 1-dimensional, and (f) 2-dimensional CsPbBr3. Two extremes of the (001) surface of the cubic phase were considered in the calculations. The former extreme corresponds to the minimum-size limit (surface energies of 9.6 meV/Å2 for CsPbI3 and 10.9 meV/Å2 for CsPbBr3, red curves) of a nanostructure while the maximum-size limit (blue curves) is derived by assuming a zero surface energy.
