Self‐Healing Inside APbBr<sub>3</sub> Halide Perovskite Crystals

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  • Davide Raffaele Ceratti
    Weizmann Institute of Science 234 Herzl Street Rehovot 7610001 Israel
  • Yevgeny Rakita
    Weizmann Institute of Science 234 Herzl Street Rehovot 7610001 Israel
  • Llorenç Cremonesi
    Department of Physics and CIMAINA University of Milan 16 via Celoria Milan 20133 Italy
  • Ron Tenne
    Weizmann Institute of Science 234 Herzl Street Rehovot 7610001 Israel
  • Vyacheslav Kalchenko
    Weizmann Institute of Science 234 Herzl Street Rehovot 7610001 Israel
  • Michael Elbaum
    Weizmann Institute of Science 234 Herzl Street Rehovot 7610001 Israel
  • Dan Oron
    Weizmann Institute of Science 234 Herzl Street Rehovot 7610001 Israel
  • Marco Alberto Carlo Potenza
    Department of Physics and CIMAINA University of Milan 16 via Celoria Milan 20133 Italy
  • Gary Hodes
    Weizmann Institute of Science 234 Herzl Street Rehovot 7610001 Israel
  • David Cahen
    Weizmann Institute of Science 234 Herzl Street Rehovot 7610001 Israel

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<jats:title>Abstract</jats:title><jats:p>Self‐healing, where a modification in some parameter is reversed with time without any external intervention, is one of the particularly interesting properties of halide perovskites. While there are a number of studies showing such self‐healing in perovskites, they all are carried out on thin films, where the interface between the perovskite and another phase (including the ambient) is often a dominating and interfering factor in the process. Here, self‐healing in perovskite (methylammonium, formamidinium, and cesium lead bromide (MAPbBr<jats:sub>3</jats:sub>, FAPbBr<jats:sub>3</jats:sub>, and CsPbBr<jats:sub>3</jats:sub>)) single crystals is reported, using two‐photon microscopy to create damage (photobleaching) ≈110 µm inside the crystals and to monitor the recovery of photoluminescence after the damage. Self‐healing occurs in all three perovskites with FAPbBr<jats:sub>3</jats:sub> the fastest (≈1 h) and CsPbBr<jats:sub>3</jats:sub> the slowest (tens of hours) to recover. This behavior, different from surface‐dominated stability trends, is typical of the bulk and is strongly dependent on the localization of degradation products not far from the site of the damage. The mechanism of self‐healing is discussed with the possible participation of polybromide species. It provides a closed chemical cycle and does not necessarily involve defect or ion migration phenomena that are often proposed to explain reversible phenomena in halide perovskites.</jats:p>

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