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Self‐Healing Inside APbBr 3 Halide Perovskite Crystals
Author(s) -
Ceratti Davide Raffaele,
Rakita Yevgeny,
Cremonesi Llorenç,
Tenne Ron,
Kalchenko Vyacheslav,
Elbaum Michael,
Oron Dan,
Potenza Marco Alberto Carlo,
Hodes Gary,
Cahen David
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201706273
Subject(s) - formamidinium , perovskite (structure) , halide , materials science , photobleaching , phase (matter) , photoluminescence , chemical physics , nanotechnology , chemical engineering , optics , inorganic chemistry , optoelectronics , chemistry , fluorescence , physics , organic chemistry , engineering
Abstract 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 3 , FAPbBr 3 , and CsPbBr 3 )) 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 3 the fastest (≈1 h) and CsPbBr 3 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.