The migration of ions under the effect of an external electric field locally modifies the doping of organometal halide perovskite films. This is used to reversibly switch the photocurrent direction in very simple photovoltaic architectures.
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Park, NG. Switchable photovoltaics. Nature Mater 14, 140–141 (2015). https://doi.org/10.1038/nmat4177
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DOI: https://doi.org/10.1038/nmat4177
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