The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells

@inproceedings{Leguy2015TheDO,
  title={The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells},
  author={Aur{\'e}lien M. A. Leguy and Jarvist Moore Frost and Andrew P. McMahon and Victoria Garc{\'i}a Sakai and W Kochelmann and Chunhung Law and Xiaoe Li and Fabrizia Foglia and Aron Walsh and Brian C O'Regan and Jenny Nelson and Jo{\~a}o T Cabral and Piers Barnes},
  booktitle={Nature communications},
  year={2015}
}
Methylammonium lead iodide perovskite can make high-efficiency solar cells, which also show an unexplained photocurrent hysteresis dependent on the device-poling history. Here we report quasielastic neutron scattering measurements showing that dipolar CH3NH3(+) ions reorientate between the faces, corners or edges of the pseudo-cubic lattice cages in CH3NH3PbI3 crystals with a room temperature residence time of ∼14 ps. Free rotation, π-flips and ionic diffusion are ruled out within a 1-200-ps… CONTINUE READING
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