Issue 20, 2018

Room temperature ferroelectricity of hybrid organic–inorganic perovskites with mixed iodine and bromine

Abstract

Ferroelectricity has been reported in organic–inorganic perovskites, and it can enhance the power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) because ferroelectricity can facilitate charge carrier separation and charge transport through the perovskite layer. However, the existence of ferroelectricity in perovskites has been in hot debate, particularly at room temperature. Here, we report the ferroelectric polarization switching of MAPb(I1−xBrx)3 which showed a high dependence on its composition. The ferroelectric behavior of MAPbI3-50% PbBr2 is confirmed with domain switching by Piezoelectric Force Microscopy (PFM) imaging and bias-off “butterfly-like” amplitude loops and piezoresponse hysteresis loops at room temperature. The possible factors, such as film electrical properties attributed to the enhanced room-temperature ferroelectricity in MAPb(I1−xBrx)3 films are clarified by using conductive atomic force microscopy (C-AFM). In addition, the charge separation and charge transport in the perovskite MAPb(I1−xBrx)3 films are further investigated by Kelvin probe force microscopy (KPFM). Finally, the possible influences of polarization orientations, trapping effects and ion migrations within the MAPb(I1−xBrx)3 films on the JV characteristics of PSC devices are discussed in detail. It discovers that the polarization switching under the positive tip biased condition in the PSCs with 50% PbBr2, which could hinder the photovoltaic performance. These findings help better understand the electronic structure of hybrid organic–inorganic perovskites and provide guidance for the improvement of the PSC performance and other electronic applications of perovskites.

Graphical abstract: Room temperature ferroelectricity of hybrid organic–inorganic perovskites with mixed iodine and bromine

Supplementary files

Article information

Article type
Paper
Submitted
12 Nov 2017
Accepted
15 Apr 2018
First published
17 Apr 2018

J. Mater. Chem. A, 2018,6, 9665-9676

Room temperature ferroelectricity of hybrid organic–inorganic perovskites with mixed iodine and bromine

J. Xiao, J. Chang, B. Li, F. H. Isikgor, D. Wang, Z. Fan, Z. Lin, J. Ouyang, K. Zeng and J. Chen, J. Mater. Chem. A, 2018, 6, 9665 DOI: 10.1039/C7TA09967C

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