On the Mechanism of Solvents Catalyzed Structural Transformation in Metal Halide Perovskites

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

4 Scopus Citations
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Author(s)

  • Jun Xi
  • Junke Jiang
  • Herman Duim
  • Lijun Chen
  • Jiaxue You
  • And 4 others
  • Giuseppe Portale
  • Shengzhong Frank Liu
  • Shuxia Tao
  • Maria Antonietta Loi

Detail(s)

Original languageEnglish
Article number162002854
Journal / PublicationAdvanced Materials
Volume35
Issue number33
Online published2 Jul 2023
Publication statusPublished - 17 Aug 2023

Link(s)

Abstract

Metal halide perovskites show the capability of performing structural transformation, allowing the formation of functional heterostructures. Unfortunately, the elusive mechanism governing these transformations limits their technological application. Herein, the mechanism of 2D–3D structural transformation is unraveled as catalyzed by solvents. By combining a spatial-temporal cation interdiffusivity simulation with experimental findings, it is validated that, protic solvents foster the dissociation degree of formadinium iodide (FAI) via dynamic hydrogen bond, then the stronger hydrogen bond of phenylethylamine (PEA) cation with selected solvents compared to dissociated FA cation facilitates 2D–3D transformation from (PEA)2PbI4 to FAPbI3. It is discovered that, the energy barrier of PEA out-diffusion and the lateral transition barrier of inorganic slab are diminished. For 2D films the protic solvents catalyze grain centers (GCs) and grain boundaries (GBs) transforme into 3D phases and quasi-2D phases, respectively. While in the solvent-free case, GCs transform into 3D–2D heterostructures along the direction perpendicular to the substrate, and most GBs evolve into 3D phases. Finally, memristor devices fabricated using the transformed films uncover that, GBs composed of 3D phases are more prone to ion migration. This work elucidates the fundamental mechanism of structural transformation in metal halide perovskites, allowing their use to fabricate complex heterostructures. © 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.

Research Area(s)

  • cation interdiffusivity, heterostructures, metal halide perovskites, solvent catalysis, structural transformation

Citation Format(s)

On the Mechanism of Solvents Catalyzed Structural Transformation in Metal Halide Perovskites. / Xi, Jun; Jiang, Junke; Duim, Herman et al.
In: Advanced Materials, Vol. 35, No. 33, 162002854, 17.08.2023.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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