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The thermodynamics and kinetics of iodine vacancies in the hybrid perovskite methylammonium lead iodide

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Abstract

The current picture of ion transport in the solar-cell absorber material CH3NH3PbI3 (MAPbI3) suffers from a disturbing lack of clarity. In this study, we demonstrate that, with knowledge of the jump rate of iodine vacancies and with a defect chemical model, various experimental data reported in the literature for the ionic conductivity of MAPbI3 can be reconciled. A quantitative expression for the vacancy jump rate was obtained by studying iodine tracer diffusion as a function of temperature and iodine-vacancy concentration by means of classical molecular-dynamics simulations. The defect-chemical model yields acceptor concentrations in experimental samples of 1015 cm−3 and lower, and the enthalpy and entropy of anti-Frenkel disorder. We also demonstrate that the generation of additional iodine vacancies can explain quantitatively the increase in the ionic conductivity under illumination. Finally, the consequences for devices under bias and for grain-boundary transport are discussed.

Graphical abstract: The thermodynamics and kinetics of iodine vacancies in the hybrid perovskite methylammonium lead iodide

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Publication details

The article was received on 11 Jun 2018, accepted on 21 Aug 2018 and first published on 30 Aug 2018


Article type: Paper
DOI: 10.1039/C8EE01697F
Citation: Energy Environ. Sci., 2018, Advance Article
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    The thermodynamics and kinetics of iodine vacancies in the hybrid perovskite methylammonium lead iodide

    D. Barboni and R. A. De Souza, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C8EE01697F

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