Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Perovskite-based solar cells constitute a special type of light-harvesting devices because, in addition to electronic mechanisms, the presence of moving ionic species is supposed to modify current-voltage curves. Hysteresis and switchable photovoltaic characteristics have been connected to the kinetics of ion migration but the nature of the specific ionic mechanism (or mechanisms) able to explain the operation distortions is still poorly understood. The local rearrangement of ions at the electrode interfaces gives rise to commonly observed capacitive effects. Here, we explore charging transients in response to step voltage stimuli using thick MAPbI3 samples deposited onto interdigitated metallic electrodes, and observe how the charging is governed by the local imbalance in the vicinity of the outer interfaces. Charging transients measures in the dark in the absence of direct current are connected to the response of a double-layer structure at the interface with the non-reacting contacts. It is observed that ionic charging, with a typical response time of 10-100 s, is a local effect confined near the electrode.
M.G.-B. acknowledges Generalitat Valencianafor the grant GRISOLIAP/2018/073.
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