Rapid and robust spatiotemporal dynamics of the first-order phase transition in crystals of the organic-inorganic perovskite (C12H25NH3)2PbI4

Aymen Yangui, Mouhamadou Sy, Liang Li, Younes Abid, Pance Naumov, Kamel Boukheddaden

Research output: Contribution to journalArticle

Abstract

The dynamics of the thermally induced first-order structural phase transition in a high-quality single crystal of the organic-inorganic perovskite (C12H25NH3)2PbI4 was investigated by optical microscopy. The propagation of the straight phase front (habit plane) during the phase transition along the cooling and heating pathways of the thermal hysteresis was observed. The thermochromic character of the transition allowed monitoring of the thermal dependence of average optical density and aided the visualization of the interface propagation. The thermal hysteresis loop is 10K wide, and the interface velocity is constant at V≈1.6mm s-1. The transition is accompanied with sizeable change in crystal size, with elongation of ∼6% along the b axis and compression of ∼ -2% along the a axis, in excellent agreement with previously reported X-ray diffraction data. The progression of the habit plane is at least 160 times faster than in spin-crossover materials, and opens new prospects for organic-inorganic perovskites as solid switching materials. Moreover, the crystals of (C12H25NH3)2PbI4 are unusually mechanically robust and present excellent resilience to thermal cycling. These hitherto unrecognized properties turn this and possibly similar hybrid perovskites into perspective candidates as active medium for microscopic actuation.

Original languageEnglish (US)
Article number16634
JournalScientific Reports
Volume5
DOIs
StatePublished - Nov 16 2015

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habits
perovskites
crystals
hysteresis
resilience
propagation
optical density
actuation
progressions
elongation
crossovers
microscopy
cooling
cycles
heating
single crystals
diffraction
x rays

ASJC Scopus subject areas

  • General

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Rapid and robust spatiotemporal dynamics of the first-order phase transition in crystals of the organic-inorganic perovskite (C12H25NH3)2PbI4 . / Yangui, Aymen; Sy, Mouhamadou; Li, Liang; Abid, Younes; Naumov, Pance; Boukheddaden, Kamel.

In: Scientific Reports, Vol. 5, 16634, 16.11.2015.

Research output: Contribution to journalArticle

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abstract = "The dynamics of the thermally induced first-order structural phase transition in a high-quality single crystal of the organic-inorganic perovskite (C12H25NH3)2PbI4 was investigated by optical microscopy. The propagation of the straight phase front (habit plane) during the phase transition along the cooling and heating pathways of the thermal hysteresis was observed. The thermochromic character of the transition allowed monitoring of the thermal dependence of average optical density and aided the visualization of the interface propagation. The thermal hysteresis loop is 10K wide, and the interface velocity is constant at V≈1.6mm s-1. The transition is accompanied with sizeable change in crystal size, with elongation of ∼6{\%} along the b axis and compression of ∼ -2{\%} along the a axis, in excellent agreement with previously reported X-ray diffraction data. The progression of the habit plane is at least 160 times faster than in spin-crossover materials, and opens new prospects for organic-inorganic perovskites as solid switching materials. Moreover, the crystals of (C12H25NH3)2PbI4 are unusually mechanically robust and present excellent resilience to thermal cycling. These hitherto unrecognized properties turn this and possibly similar hybrid perovskites into perspective candidates as active medium for microscopic actuation.",
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