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By means of non-resonant Raman spectroscopy and density functional theorycalculations, we measure and assign the vibrational spectrum of two distincttwo-dimensional lead-iodide perovskite derivatives. These two samples areselected in order to probe the effects of the organic cation on latticedynamics. One templating cation is composed of a phenyl-substituted ammoniumderivative, while the other contains a linear alkyl group. We find that modesthat directly involve the organic cation are more prevalent in thephenyl-substituted derivative. Comparison of the temperature dependence of theRaman spectra reveals differences in the nature of dynamic disorder, with astrong dependence on the molecular nature of the organic moiety.

Lattice vibrations and dynamic disorder in two-dimensional hybrid lead-halide perovskites