In this work, the authors investigate the ferroelectric properties of methylammonium lead iodide, which is the reference material for modern perovskite solar cells.
By usage of a particular device architecture of a Si-substrate with microstructured gold electrodes, poling fields are applied to the thin films in lateral direction. Piezoresponse Force Microscopy reveals poling of ferroelectric domains on the nanometer scale, which in turn results in a change of macroscopic conductivity. The electric field that is required to trigger the poling process is of a similar magnitude as electric fields in a solar cell under operation, which underlines the importance of understanding the relationship between microsctructure and solar cell performance.
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