Visualizing phase segregation in mixed-halide perovskite single crystals

Wenxin Mao, Christopher R. Hall, Anthony S.R. Chesman, Craig Forsyth, Yi Bing Cheng, Noel W. Duffy, Trevor A. Smith, Udo Bach

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Mixed organolead halide perovskites (MOHPs), CH3NH3 Pb(BrxI1−x)3, have been shown to undergo phase segregation into iodide-rich domains under illumination, which presents a major challenge to their development for photovoltaic and light-emitting devices. Recent work suggested that phase-segregated domains are localized at crystal boundaries, driving investigations into the role of edge structure and the growth of larger crystals with reduced surface area. Herein, a method for growing large (30×30×1 μm3) monocrystalline MAPb(BrxI1−x)3 single crystals is presented. The direct visualization of the growth of nanocluster-like I-rich domains throughout the entire crystal revealed that grain boundaries are not required for this transformation. Narrowband fluorescence imaging and time-resolved spectroscopy provided new insight into the nature of the phase-segregated domains and the collective impact on the optoelectronic properties.

Original languageEnglish
Pages (from-to)2893-2898
Number of pages6
JournalAngewandte Chemie - International Edition
Volume58
Issue number9
DOIs
Publication statusPublished - 25 Feb 2019

Keywords

  • lifetime
  • perovskites
  • phase segregation
  • photoluminescence
  • single crystals

Cite this

Mao, Wenxin ; Hall, Christopher R. ; Chesman, Anthony S.R. ; Forsyth, Craig ; Cheng, Yi Bing ; Duffy, Noel W. ; Smith, Trevor A. ; Bach, Udo. / Visualizing phase segregation in mixed-halide perovskite single crystals. In: Angewandte Chemie - International Edition. 2019 ; Vol. 58, No. 9. pp. 2893-2898.
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title = "Visualizing phase segregation in mixed-halide perovskite single crystals",
abstract = "Mixed organolead halide perovskites (MOHPs), CH3NH3 Pb(BrxI1−x)3, have been shown to undergo phase segregation into iodide-rich domains under illumination, which presents a major challenge to their development for photovoltaic and light-emitting devices. Recent work suggested that phase-segregated domains are localized at crystal boundaries, driving investigations into the role of edge structure and the growth of larger crystals with reduced surface area. Herein, a method for growing large (30×30×1 μm3) monocrystalline MAPb(BrxI1−x)3 single crystals is presented. The direct visualization of the growth of nanocluster-like I-rich domains throughout the entire crystal revealed that grain boundaries are not required for this transformation. Narrowband fluorescence imaging and time-resolved spectroscopy provided new insight into the nature of the phase-segregated domains and the collective impact on the optoelectronic properties.",
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author = "Wenxin Mao and Hall, {Christopher R.} and Chesman, {Anthony S.R.} and Craig Forsyth and Cheng, {Yi Bing} and Duffy, {Noel W.} and Smith, {Trevor A.} and Udo Bach",
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Mao, W, Hall, CR, Chesman, ASR, Forsyth, C, Cheng, YB, Duffy, NW, Smith, TA & Bach, U 2019, 'Visualizing phase segregation in mixed-halide perovskite single crystals', Angewandte Chemie - International Edition, vol. 58, no. 9, pp. 2893-2898. https://doi.org/10.1002/anie.201810193

Visualizing phase segregation in mixed-halide perovskite single crystals. / Mao, Wenxin; Hall, Christopher R.; Chesman, Anthony S.R.; Forsyth, Craig; Cheng, Yi Bing; Duffy, Noel W.; Smith, Trevor A.; Bach, Udo.

In: Angewandte Chemie - International Edition, Vol. 58, No. 9, 25.02.2019, p. 2893-2898.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Bach, Udo

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