In Situ Grazing-Incidence Wide-Angle Scattering Reveals Mechanisms for Phase Distribution and Disorientation in 2D Halide Perovskite Films

Justin M. Hoffman, Joseph Strzalka, Nathan C. Flanders, Ido Hadar, Shelby A. Cuthriell, Qingteng Zhang, Richard D. Schaller, William R. Dichtel, Lin X. Chen*, Mercouri G. Kanatzidis

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

2D hybrid halide perovskites with the formula (A′)2(A)n-1PbnI3n+1 have remarkable stability and promising efficiency in photovoltaic and optoelectronic devices, yet fundamental understanding of film formation, key to optimizing these devices, is lacking. Here, in situ grazing-incidence wide-angle X-ray scattering (GIWAXS) is used to monitor film formation during spin-coating. This elucidates the general film formation mechanism of 2D halide perovskites during one-step spin-coating. There are three stages of film formation: sol–gel, oriented 3D, and 2D. Three precursor phases form during the sol–gel stage and transform to perovskite, first giving a highly oriented 3D-like phase at the air/liquid interface followed by subsequent nucleations forming slightly less oriented 2D perovskite. Furthermore, heating before crystallization leads to fewer nucleations and faster removal of the precursors, improving orientation. This outlines the primary causes of phase distribution and perpendicular orientation in 2D perovskite films and paves the way for rationally designed film fabrication techniques.

Original languageEnglish (US)
Article number2002812
JournalAdvanced Materials
Volume32
Issue number33
DOIs
StatePublished - Aug 1 2020

Keywords

  • 2D halide perovskites, film formation
  • kinetics
  • photovoltaics
  • spin-coating, thin films

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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