Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.022
Publication date: 23rd September 2021
Lead halide perovskites have gained much attention in recent years for their remarkable optoelectronic properties as they can be applied in various devices as highly efficient active semiconductor material e.g., in solar cells, x-ray detectors or LEDs. One obstacle to commercialization is the migration of halide ions, which leads to efficiency losses and degradation. Ion migration via point defects also contributes significantly to the total electrical conductivity of halide perovskites. Thus, defect chemical investigations are a key to understand and engineer the electrical properties of halide perovskites.
In this work, we present a setup to measure the electrical conductivity of the model halide perovskite Methylammonium Lead Iodide over a wide range of iodine partial pressures. We find the electrical conductivity to change with different slopes in dependence of the iodine partial pressure in a double-logarithmic representation. This indicates changes in the perovskite’s conduction mechanism, i.e., changes in point defect concentrations. Considering differences in the mobilities of the various defect species, we discuss the dependence of the total conductivity of the perovskite on the iodine partial pressure. Our work will allow to develop a more fundamental understanding about the electrical properties of halide perovskites.
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