Ferroelectricity-free lead halide perovskites

In the recent publication “Ferroelectricity-free lead halide perovskites” Andrés Gómez, Qiong Wang, Alejandro R. Goñi, Mariano Campoy-Quilesa and Antonio Abate describe how they employed direct piezoelectric force microscopy ( DPFM ) to examine whether or not lead halide perovskites exhibit ferroelectricity.*

Their article aims to provide a deeper understanding of the fundamental physical properties of the organic–inorganic lead halide perovskites and solves a longstanding dispute about their non-ferroelectric character: an issue of high relevance for optoelectronic and photovoltaic applications.*

In the course of their research in which besides using DPFM, they also employed piezoelectric force microscopy ( PFM ) and electrostatic force microscopy ( EFM ), they could demonstrate the non-ferroelectricity of lead halide perovskites. *

The PFM images were acquired using a PtIr coated NANOSENSORS PPP-EFM AFM probe.

Fig. 5 from “*Ferroelectricity-free lead halide perovskites*” by Andrés Gómez et al.: Scheme of the three AFM modes DPFM (a), EFM (b) and PFM (c) with the measurement results of the MAPbI3 perovskite at a film thickness of 152 nm ((i): scanning from left to right, and (ii): scanning from right to left for DPFM measurements; and (iii) and (iv) for EFM and PFM measurements, respectively), 218 nm ((v): scanning from left to right, and (vi): scanning from right to left for DPFM measurements; and (vii) and (viii) for EFM and PFM measurements, respectively), and 400 nm ((ix): scanning from left to right, and (x): scanning from right to left for DPFM measurements; and (xi) and (xii) for EFM and PFM measurements, respectively). Insets given in (iii), (vii), and (xi) are the topography channel of EFM images of the samples.

*Andrés Gómez, Qiong Wang, Alejandro R. Goñi, Mariano Campoy-Quilesa, Antonio Abate
Ferroelectricity-free lead halide perovskites
Energy Environ. Sci., 2019, Advance Article
doi: 10.1039/C9EE00884E

Please follow this external link to the full article: https://pubs.rsc.org/en/content/articlelanding/2019/ee/c9ee00884e#!divAbs tract

Open Access: The article “Ferroelectricity-free lead halide perovskites” by Andrés Gómez, Qiong Wang, Alejandro R. Goñi, Mariano Campoy-Quilesa and Antonio Abate is licensed under a Creative Commons Attribution 3.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. To view a copy of this license, visit https://creativecommons.org/licenses/by/3.0/