Self-Healing and Light-Soaking in MAPbI3: The Effect of H2O

Davide Raffaele Ceratti, Ron Tenne, Andrea Bartezzaghi, Llorenç Cremonesi, Lior Segev, Vyacheslav Kalchenko, Dan Oron, Marco Alberto Carlo Potenza, Gary Hodes, David Cahen

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The future of halide perovskites (HaPs) is beclouded by limited understanding of their long-term stability. While HaPs can be altered by radiation that induces multiple processes, they can also return to their original state by “self-healing.” Here two-photon (2P) absorption is used to effect light-induced modifications within MAPbI3 single crystals. Then the changes in the photodamaged region are followed by measuring the photoluminescence, from 2P absorption with 2.5 orders of magnitude lower intensity than that used for photodamaging the MAPbI3. After photodamage, two brightening and one darkening process are found, all of which recover but on different timescales. The first two are attributed to trap-filling (the fastest) and to proton-amine-related chemistry (the slowest), while photodamage is attributed to the lead-iodide sublattice. Surprisingly, while after 2P-irradiation of crystals that are stored in dry, inert ambient, photobrightening (or “light-soaking”) occurs, mostly photodarkening is seen after photodamage in humid ambient, showing an important connection between the self-healing of a HaP and the presence of H2O, for long-term steady-state illumination, practically no difference remains between samples kept in dry or humid environments. This result suggests that photobrightening requires a chemical-reservoir that is sensitive to the presence of H2O, or possibly other proton-related, particularly amine, chemistry.

Original languageEnglish
Article number2110239
JournalAdvanced Materials
Volume34
Issue number35
DOIs
StatePublished - 1 Sep 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH.

Funding

The authors thank Dr. Sigalit Aharon for providing help with the cutting of halide perovskite single crystals for two-photon imaging. The authors also thank Dr. Gennady Uraltsev for the assistance with the calculations. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 893194. D.C. and D.O. thank the Yotam project (via the Sustainability and Energy Research Initiative, SAERI, of the Weizmann Institute), G.H. and D.C. thank the Minerva Centre for Self-Repairing Systems for Energy & Sustainability, and the CNRS-Weizmann program for support. The authors thank Dr. Sigalit Aharon for providing help with the cutting of halide perovskite single crystals for two‐photon imaging. The authors also thank Dr. Gennady Uraltsev for the assistance with the calculations. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska‐Curie grant agreement No. 893194. D.C. and D.O. thank the Yotam project (via the Sustainability and Energy Research Initiative, SAERI, of the Weizmann Institute), G.H. and D.C. thank the Minerva Centre for Self‐Repairing Systems for Energy & Sustainability, and the CNRS‐Weizmann program for support.

FundersFunder number
Minerva Centre for Self-Repairing Systems for Energy & Sustainability
Minerva Centre for Self‐Repairing Systems for Energy & Sustainability
SAERI
Sustainability and Energy Research Initiative
Horizon 2020 Framework Programme893194
H2020 Marie Skłodowska-Curie Actions
Horizon 2020

    Keywords

    • halide perovskites stability
    • light-soaking
    • self-healing
    • self-repair
    • water

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