Self-Healing and Light-Soaking in MAPbI 3 : The Effect of H 2 O.

Autor: Ceratti DR; Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 7610001, Israel.; CNRS, UMR 9006, IPVF, Institut Photovoltaïque d'Ile-de-France, 18 Boulevard Thomas Gobert, Palaiseau, 91120, France., Tenne R; Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, 7610001, Israel., Bartezzaghi A; Institute of Mathematics, École Polytechnique Fédérale de Lausanne, Station 8, Lausanne, CH-1015, Switzerland., Cremonesi L; Department of Physics and CIMAINA, University of Milan, via Celoria, 16, Milan, 20133, Italy., Segev L; Department of Physics Core Facilities Lab Automation Software Unit, Weizmann Institute of Science, Rehovot, 7610001, Israel., Kalchenko V; Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 7610001, Israel., Oron D; Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, 7610001, Israel., Potenza MAC; Department of Physics and CIMAINA, University of Milan, via Celoria, 16, Milan, 20133, Italy., Hodes G; Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 7610001, Israel., Cahen D; Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 7610001, Israel.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2022 Sep; Vol. 34 (35), pp. e2110239. Date of Electronic Publication: 2022 Jul 29.
DOI: 10.1002/adma.202110239
Abstrakt: 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 MAPbI 3 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 MAPbI 3 . 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 H 2 O, 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 H 2 O, or possibly other proton-related, particularly amine, chemistry.
(© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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