@article{Leguy:2015:10.1038/ncomms8124,
author = {Leguy, AMA and Frost, JM and McMahon, AP and Sakai, VG and Kochelmann, W and Law, C and Li, X and Foglia, F and Walsh, A and O'Regan, BC and Nelson, J and Cabral, JT and Barnes, PRF},
doi = {10.1038/ncomms8124},
journal = {Nature Communications},
title = {The dynamics of methylammonium ions in hybrid organic-inorganic perovskite solar cells},
url = {http://dx.doi.org/10.1038/ncomms8124},
volume = {6},
year = {2015}
}

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TY  - JOUR
AB  - 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 time window. Monte Carlo simulations of interacting CH3NH3+ dipoles realigning within a 3D lattice suggest that the scattering measurements may be explained by the stabilization of CH3NH3+ in either antiferroelectric or ferroelectric domains. Collective realignment of CH3NH3+ to screen a device’s built-in potential could reduce photovoltaic performance. However, we estimate the timescale for a domain wall to traverse a typical device to be ~0.1–1 ms, faster than most observed hysteresis.
AU  - Leguy,AMA
AU  - Frost,JM
AU  - McMahon,AP
AU  - Sakai,VG
AU  - Kochelmann,W
AU  - Law,C
AU  - Li,X
AU  - Foglia,F
AU  - Walsh,A
AU  - O'Regan,BC
AU  - Nelson,J
AU  - Cabral,JT
AU  - Barnes,PRF
DO  - 10.1038/ncomms8124
PY  - 2015///
SN  - 2041-1723
TI  - The dynamics of methylammonium ions in hybrid organic-inorganic perovskite solar cells
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/ncomms8124
UR  - http://hdl.handle.net/10044/1/25669
VL  - 6
ER  - 

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