Journal
AIP ADVANCES
Volume 7, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4994957
Keywords
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Funding
- Alexander von Humboldt Foundation
- Max Planck Institute for Polymer Research
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Ferroelectricity has been proposed as one of the potential origins of the observed hysteresis in photocurrent-voltage characteristics of perovskite based solar cells. Measurement of ferroelectric properties on perovskite solar cells is hindered by the presence of (in)organic charge transport layers. Here we fabricate metal-perovskite-metal capacitors and unambiguously show that methylammonium lead iodide is not ferroelectric at room temperature. We propose that the hysteresis originates from the movement of positive ions rather than ferroelectric switching. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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