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Comment on "ferroelectricity-free lead halide perovskites" by A. Gomez, Q. Wang, A. R. Goni, M. Campoy-Quiles and A. Abate, Energy Environ. Sci., 2019, 12, 2537

Colsmann, Alexander; Leonhard, Tobias; Schulz, Alexander D.; Röhm, Holger

This article comments on the recent publication ‘‘Ferroelectricity-free lead halide perovskites’’ by Gomez´et al. [DOI: 10.1039/c9ee00884e], in which the authors conclude that both methylammonium lead iodide (MAPbI$_{3}$) and the more advanced Cs$_{0.05}$(FA$_{0.83}$MA$_{0.17}$)$_{0.95}$Pb(I$_{0.83}$Br$_{0.17}$)$_{3}$ form non-ferroelectric thin-films. This conclusion is based on measuring the vertical piezoelectric effect by ‘‘direct piezoelectric force microscopy’’ (DPFM) and not seeing any domain patterns or other ferroelectric responses. The authors calibrated their measurement using a bulk reference sample of periodically poled lithium niobate with vertical polarization, which has all-different properties from MAPbI$_{3}$ or Cs$_{0.05}$(FA$_{0.83}$MA$_{0.17}$)$_{0.95}$Pb(I$_{0.83}$Br$_{0.17}$)$_{3}$ thin-films. In earlier works, it was pointed out that the polarization in large MAPbI$_{3}$ grains is vastly oriented in-plane and hence could remain invisible to any probing techniques with vertical sensitivity. In addition, the low spatial resolution of their measurements, the strong measurement noise, potential adventitious water contamination and the use of improper cantilever loads reduces the sensitivity of the measurement setup. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000121970
Veröffentlicht am 23.07.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Lichttechnisches Institut (LTI)
Materialwissenschaftliches Zentrum für Energiesysteme (MZE)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.06.2020
Sprache Englisch
Identifikator ISSN: 1754-5692, 1754-5706
KITopen-ID: 1000121970
Erschienen in Energy & environmental science
Band 13
Heft 6
Seiten 1888–1891
Nachgewiesen in Web of Science
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