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- W4320839013 abstract "The diffusion of iodine defects has been considered the most important degradation mechanism of methylammonium lead iodine (MAPI) in solar cells. The present study demonstrates the importance of the pressure inside this material on the dynamics of iodine defects, using molecular dynamics simulations. It is known that the diffusion coefficient of an iodine vacancy is an order of magnitude higher than that of interstitial iodine. We show that this difference systematically increases with increased tensile strain and that both diffusion coefficients tend to zero when a compressive strain is applied. This result suggests that compression of the MAPI can be a good solution to reduce its degradation rate. %Also, different methods of determining the diffusion coefficient, including mean squared displacement (MSD) and velocity auto-correlation function, are discussed and applied to the case of ${rm V}_{rm I}$. Besides, the statistical aspect of deriving the diffusion coefficient from the mean squared displacement (MSD) is discussed in terms of the initial conditions (positions and velocities) of the atoms and the simulation time, considering different seeds of the pseudo-random number generator used in the simulations performed with the LAMMPS software." @default.
- W4320839013 created "2023-02-15" @default.
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- W4320839013 date "2023-02-11" @default.
- W4320839013 modified "2023-09-29" @default.
- W4320839013 title "Effect of pressure on the dynamics of iodine defects in MAPI: An atomistic simulation" @default.
- W4320839013 doi "https://doi.org/10.48550/arxiv.2302.05696" @default.
- W4320839013 hasPublicationYear "2023" @default.
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