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

Jun Xi, Junke Jiang, Herman Duim, Lijun Chen, Jiaxue You, Giuseppe Portale, Shengzhong Liu, Shuxia Tao (Corresponding author), Maria Antonietta Loi (Corresponding author)

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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.

Original languageEnglish
Article number2302896
Number of pages9
JournalAdvanced Materials
Volume35
Issue number33
Early online date12 Jun 2023
DOIs
Publication statusPublished - Aug 2023

Bibliographical note

Funding Information:
J.X. and J.J. contributed equally to this work. The authors appreciate the technical support from Arjen Kamp and Teo Zaharia. J.X. and M.A.L. acknowledge the Materials for Sustainability (Mat4Sus) program (739.017.005) of the Netherlands Organization for Scientific Research (NWO). This work is part of the program of the NWO‐focus Group “Next Generation Organic Photovoltaics”, participating in the Dutch Institute for Fundamental Energy Research (DIFFER). M.A.L. and L.C. would like to acknowledge the financial support of the CogniGron research center of the University of Groningen. S.T. and J.J. acknowledge funding by the Computational Sciences for Energy Research (CSER) tenure track program of Shell and NWO (Project number15CST04‐2) and NWO START‐UP, the Netherlands.

Keywords

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

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