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. 2017 May 11;8:15218. doi: 10.1038/ncomms15218

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Schematic representation of possible O₂ binding and reduction sites in CH₃NH₃PbI₃ ([001] plane) and corresponding superoxide formation energy: (a) face site neighbouring four iodide ions, (b) neutral iodide vacancy (with a photoelectron on the defect site) and negatively charged lead (c) and methylammonium (d) vacancies (with no photoelectron on them since this was found to be unphysical).