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Ferroelectric Properties of Perovskite Thin Films and Their Implications for Solar Energy Conversion

Röhm, Holger; Leonhard, Tobias; Schulz, Alexander D.; Wagner, Susanne; Hoffmann, Michael J.; Colsmann, Alexander

Abstract:
Whether or not methylammonium lead iodide (MAPbI3) is a ferroelectric
semiconductor has caused controversy in the literature, fueled by many
misunderstandings and imprecise definitions. Correlating recent literature
reports and generic crystal properties with the authors’ experimental
evidence, the authors show that MAPbI3 thin-films are indeed semiconducting
ferroelectrics and exhibit spontaneous polarization upon transition from the
cubic high-temperature phase to the tetragonal phase at room temperature.
The polarization is predominantly oriented in-plane and is organized in
characteristic domains as probed with piezoresponse force microscopy.
Drift-diffusion simulations based on experimental patterns of polarized
domains indicate a reduction of the Shockley–Read–Hall recombination of
charge carriers within the perovskite grains due to the ferroelectric built-in field
and allow reproduction of the electrical solar cell properties.

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Preprint §
DOI: 10.5445/IR/1000091665
Veröffentlicht am 27.02.2019
Originalveröffentlichung
DOI: 10.1002/adma.201806661
Coverbild
Zugehörige Institution(en) am KIT Lichttechnisches Institut (LTI)
Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Materialwissenschaftliches Zentrum für Energiesysteme (MZE)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0935-9648
urn:nbn:de:swb:90-916657
KITopen-ID: 1000091665
Erschienen in Advanced materials
Seiten Art.Nr.: 1806661
Vorab online veröffentlicht am 20.02.2019
Schlagworte ferroelectric domains, perovskite solar cells, piezoresponse force microscopy
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