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

doi:10.1038/s43246-022-00287-7

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^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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 language	English
Article number	70
Journal	Communications Materials
Volume	3
Issue number	1
DOIs	https://doi.org/10.1038/s43246-022-00287-7
Publication status	Published - Dec 2022

Funding

We thank Guy Reuveni and Dr. Omer Yaffe (Weizmann Inst.) for the Raman spectroscopy measurements, Dr. Gili Cohen-Taguri (BIU) for her expert assistance with the humidity-dependent XRD measurements and Prof. Ilya Grinberg (BIU) and Ms. Anat Itzhak (BIU) for fruitful discussions and ideas. DRC thanks the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 893194. NPJ acknowledges funding from the European Union’s Horizon 2020 MSCA Innovative Training Network MAESTRO under grant agreement no. 764787 at BIU. At BIU This work was further supported by the Israel Ministry of Energy as part of the SolarERAnet PERDRY consortium. At the Weizmann Institute the work was supported by the Yotam project, the Minerva Centre for Self-Repairing Systems for Energy & Sustainability, and the CNRS-Weizmann program.

All Science Journal Classification (ASJC) codes

General Materials Science
Mechanics of Materials

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title = "Nanomechanical signatures of degradation-free influence of water on halide perovskite mechanics",

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{\textquoteright} 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.",

author = "Isaac Buchine and Irit Rosenhek-Goldian and Jasti, {Naga Prathibha} and Ceratti, {Davide R} and Sujit Kumar and David Cahen and Cohen, {Sidney R}",

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AU - Buchine, Isaac

AU - Rosenhek-Goldian, Irit

AU - Jasti, Naga Prathibha

AU - Ceratti, Davide R

AU - Kumar, Sujit

AU - Cahen, David

AU - Cohen, Sidney R

PY - 2022/12

Y1 - 2022/12

N2 - 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.

AB - 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.

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

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