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Visualizing Phase Segregation in Mixed-Halide Perovskite Single Crystals.

Wenxin Mao1,2, Christopher R Hall2,3, Anthony S R Chesman2,4,5

  • 1Department of Chemical Engineering, Monash University, Clayton, Victoria, Australia.

Angewandte Chemie (International Ed. in English)
|November 21, 2018
PubMed
Summary
This summary is machine-generated.

Mixed organolead halide perovskites (MOHPs) undergo light-induced phase segregation, hindering device performance. This study shows segregation occurs throughout crystals, not just at boundaries, offering new insights for optoelectronic applications.

Keywords:
lifetimeperovskitesphase segregationphotoluminescencesingle crystals

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Photovoltaics

Background:

  • Mixed organolead halide perovskites (MOHPs) are promising for optoelectronic devices.
  • Light-induced phase segregation into iodide-rich domains limits their stability and performance.
  • Previous studies suggested segregation occurs at crystal boundaries.

Purpose of the Study:

  • To investigate the mechanism of light-induced phase segregation in MOHPs.
  • To develop a method for growing large, high-quality MOHP single crystals.
  • To understand the role of crystal boundaries in phase segregation.

Main Methods:

  • Growth of large monocrystalline methylammonium lead (bromoiodide)3 [CH3NH3Pb(BrxI1-x)3] single crystals (30×30×1 μm3).
  • Direct visualization of nanocluster-like iodide-rich domain formation.
  • Narrowband fluorescence imaging and time-resolved spectroscopy.

Main Results:

  • Phase segregation into iodide-rich domains occurs throughout the entire crystal volume, not exclusively at grain boundaries.
  • The growth of large single crystals facilitates the study of intrinsic segregation phenomena.
  • Optoelectronic properties are collectively impacted by these distributed domains.

Conclusions:

  • Grain boundaries are not essential for light-induced phase segregation in MOHPs.
  • Understanding the bulk segregation mechanism is crucial for improving MOHP device stability.
  • This work provides new insights into the optoelectronic behavior of MOHPs under illumination.