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Ferroelectric Poling of Methylammonium Lead Iodide Thin Films

Röhm, Holger ORCID iD icon 1,2; Leonhard, Tobias 1,2; Hoffmann, Michael J. 2,3; Colsmann, Alexander ORCID iD icon 1,2
1 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)
2 Materialwissenschaftliches Zentrum für Energiesysteme (MZE), Karlsruher Institut für Technologie (KIT)
3 Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1), Karlsruher Institut für Technologie (KIT)


Seemingly contradictory reports on polar domains and their origin have surrounded the controversial discussion about the ferroelectricity of the methyl ammonium lead iodide (MAPbI$_{3}$) thin films that are commonly employed in perovskite solar cells. In this work, microscopic modulations of the polar domain patterns upon application of an electric poling field are correlated with macroscopic changes to the currents through the MAPbI$_{3}$ layer. Piezoresponse force microscopy is used to monitor the widening, narrowing, generation or extinction of polar domains, as well as shifts of the domain walls at room temperature under an in‐plane electric poling field that is applied between two laterally organized electrodes. This poling leads to a net polarization of individual grains and the thin film itself. Macroscopically, this net polarization results in a persistent shift of the diode characteristics that is measured across the channel between the electrodes. Both the modulation of the polar domains upon electric poling and the concurrent persistent shift of the electric currents through the device are the unambiguous hallmarks of ferroelectricity, which demonstrate that MAPbI$_{3}$ is a ferroelectric semiconductor.

Verlagsausgabe §
DOI: 10.5445/IR/1000100415
Veröffentlicht am 02.12.2019
DOI: 10.1002/adfm.201908657
Zitationen: 31
Web of Science
Zitationen: 31
Zitationen: 32
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1)
Lichttechnisches Institut (LTI)
Materialwissenschaftliches Zentrum für Energiesysteme (MZE)
Universität Karlsruhe (TH) – Zentrale Einrichtungen (Zentrale Einrichtungen)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 29.01.2020
Sprache Englisch
Identifikator ISSN: 1616-301X, 1616-3028
KITopen-ID: 1000100415
Erschienen in Advanced functional materials
Verlag Wiley-VCH Verlag
Band 30
Heft 5
Seiten Art.Nr. 908657
Vorab online veröffentlicht am 19.11.2019
Nachgewiesen in Web of Science
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