The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells
Imperial College London · University of Bath · +2 more institutions
Abstract
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…
Citation impact
- FWCI
- 62.44
- Percentile
- 100%
- References
- 71
Authors
13Topics & keywords
- Ion
- Perovskite (structure)
- Chemical physics
- Materials science
- Dipole
- Iodide
- Scattering
- Neutron scattering
- Affordable and clean energy