A DFT study reports that reducing crystal symmetry from cubic to pseudo-cubic softens FAPbCl3 and FAPbBr3 but stiffens FAPbI3, with strongly anisotropic nonlinear stress-strain response.
Absolute energy level positions in tin-and lead-based halide perovskites
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Symmetry-Dependent Mechanical and Vibrational Response of Formamidinium Lead Halide Perovskites: A DFT Study
A DFT study reports that reducing crystal symmetry from cubic to pseudo-cubic softens FAPbCl3 and FAPbBr3 but stiffens FAPbI3, with strongly anisotropic nonlinear stress-strain response.