Nanomechanical signatures of degradation-free influence of water on halide perovskite mechanics

Isaac Buchine, Irit Rosenhek-Goldian, Naga Prathibha Jasti, Davide R. Ceratti, Sujit Kumar, David Cahen, Sidney R. Cohen

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7 Scopus citations

Abstract

Humidity is often reported to compromise the stability of lead halide perovskites or of devices based on them. Here we measure the humidity dependence of the elastic modulus and hardness for two series of lead halide perovskite single crystals, varying either by cation or by anion type. The results reveal a dependence on bond length between, hydrogen bonding with, and polarizability/polarization of these ions. The results show an intriguing inverse relation between modulus and hardness, in contrast to their positive correlation for most other materials. This anomaly persists and is strengthened by the effect of humidity. This, and our overall findings are ascribed to the materials’ unique atomic-scale structure and properties, viz nano-polar domains and strong dynamic disorder, yet high-quality average order. Our conclusions are based on comparing results obtained from several different nano-indentation techniques, which separate surface from bulk elastic modulus, and probe different manifestations of the hardness.

Original languageEnglish
Article number70
JournalCommunications Materials
Volume3
Issue number1
DOIs
StatePublished - Dec 2022

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© 2022, The Author(s).

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