  In this work, we compare existing non-polarizable force fields developed to
study the solid or solution phases of hybrid organic-inorganic halide
perovskites with the AMOEBA polarizable force field. The aim is to test whether
more computationally expensive polarizable force fields like AMOEBA offer
better transferability between solution and solid phases, with the ultimate
goal being the study of crystal nucleation, growth and other interfacial
phenomena involving these ionic compounds. In the context of hybrid
perovskites, AMOEBA force field parameters already exist for several elements
in solution and we decided to leave them unchanged and to only parameterize the
missing ones (Pb\textsuperscript{2+} and
CH\textsubscript{3}NH\textsubscript{3}\textsuperscript{+} ions) in order to
maximise transferability and avoid over-fitting to the specific examples
studied here. Overall, we find that AMOEBA yields accurate hydration free
energies (within 5\%) for typical ionic species while showing the correct
ordering of stability for the different crystal polymorphs of
CsPbI\textsubscript{3} and
CH\textsubscript{3}NH\textsubscript{3}PbI\textsubscript{3}. While the existing
parameters do not accurately reproduce all transition temperatures and lattice
parameters, AMOEBA offers better transferability between solution and solid
states than existing non-polarizable force fields.
