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. 2016 Aug 1;7:12253. doi: 10.1038/ncomms12253

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Copyright © 2016, The Author(s)

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Schematically, charge carriers can induce rotational re-organization of the surrounding CH₃NH₃ dipoles (green arrows), leading to the formation of dipolar polarons. Such polarons could account for the relatively low intrinsic charge-carrier mobilities and reduced bimolecular recombination coefficients experimentally revealed in this work. The structure of hybrid perovskite unit cell, with PbI₆ or PbBr₆ octahedra and a polar methylammonium molecular cation at the centre, is shown in the upper left corner. The green arrows in the main panel represent these polar methylammonium cations.