Comment on “ferroelectricity-free lead halide perovskites” by A. Gómez, Q. Wang, A. R. Goñi, M. Campoy-Quiles and A. Abate, Energy Environ. Sci., 2019, 12, 2537,Energy & Environmental Science

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Comment on “ferroelectricity-free lead halide perovskites” by A. Gómez, Q. Wang, A. R. Goñi, M. Campoy-Quiles and A. Abate, Energy Environ. Sci., 2019, 12, 2537
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-05-29 , DOI: 10.1039/c9ee04159a
Alexander Colsmann _{1,

1,

2,

3,

4} , Tobias Leonhard _{1,

1,

2,

3,

4} , Alexander D. Schulz _{1,

1,

2,

3,

4} , Holger Röhm _{1,

1,

2,

3,

4}

Affiliation

This article comments on the recent publication “Ferroelectricity-free lead halide perovskites” by Gómez et al. [DOI: 10.1039/c9ee00884e], in which the authors conclude that both methylammonium lead iodide (MAPbI₃) and the more advanced Cs_0.05(FA_0.83MA_0.17)_0.95Pb(I_0.83Br_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 MAPbI₃ or Cs_0.05(FA_0.83MA_0.17)_0.95Pb(I_0.83Br_0.17)₃ thin-films. In earlier works, it was pointed out that the polarization in large MAPbI₃ 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. This is why the conclusion on MAPbI₃ being non-ferroelectric is not supported by the measurement data.

中文翻译：

A.Gómez，Q。Wang，ARGoñi，M。Campoy-Quiles和A. Abate（能源环境）对“无铁电卤化钙钛矿”的评论。科学，2019，12，2537

本文评论了Gómez等人的最新出版物“无铁电的卤化钙钛矿” 。[DOI：10.1039 / c9ee00884e]，作者得出的结论是，甲基铵碘化铅（MAPbI ₃）和更高级的Cs _0.05（FA _0.83 MA _0.17）_0.95 Pb（I _0.83 Br _0.17）₃形成非铁电薄膜。该结论是基于通过“直接压电力显微镜”（DPFM）测量垂直压电效应而没有看到任何畴图案或其他铁电响应的。作者使用具有垂直极化的周期性极化铌酸锂的大量参考样品校准了测量，该样品具有与MAPbI ₃或Cs _0.05（FA _0.83 MA _0.17）_0.95 Pb（I _0.83 Br _0.17）₃薄膜完全不同的特性。在较早的工作中，有人指出大MAPbI ₃中的极化晶粒在面内的取向很大，因此任何具有垂直灵敏度的探测技术都可能看不见它们。此外，其测量的空间分辨率低，强大的测量噪声，潜在的不定水污染以及使用不适当的悬臂负载会降低测量设置的灵敏度。这就是为什么测量数据不支持关于MAPbI ₃是非铁电的结论的原因。

更新日期：2020-06-19

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