The Nature of Ion Conduction in Methylammonium Lead Iodide: A Multimethod 
Approach

Senocrate, A.; Moudrakovski, I.; Kim, G. Y.; Yang, T.-Y.; Gregori, G.; Grätzel, M.; Maier, J.

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The Nature of Ion Conduction in Methylammonium Lead Iodide: A Multimethod Approach

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Gregori, G.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Senocrate, A., Moudrakovski, I., Kim, G. Y., Yang, T.-Y., Gregori, G., Grätzel, M., et al. (2017). The Nature of Ion Conduction in Methylammonium Lead Iodide: A Multimethod Approach. Angewandte Chemie International Edition, 56(27), 7755-7759.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D27C-A

Abstract

By applying a multitude of experimental techniques including H-1, N-14, Pb-207 NMR and I-127 NMR/NQR, tracer diffusion, reaction cell and doping experiments, as well as stoichiometric variation, conductivity, and polarization experiments, iodine ions are unambiguously shown to be the mobile species in CH3NH3PbI3, with iodine vacancies shown to represent the mechanistic centers under equilibrium conditions. Pb2+ and CH3NH3+ ions do not significantly contribute to the long range transport (upper limits for their contributions are given), whereby the latter exhibit substantial local motion. The decisive electronic contribution to the mixed conductivity in the experimental window stems from electron holes. As holes can be associated with iodine orbitals, local variations of the iodine stoichiometry may be fast and enable light effects on ion transport.