In this section
@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}
}
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 -
Jenny Nelson
Professor of Physics
1007, Huxley Building
South Kensington, London, SW7 2AZ