Insights into operational stability and processing of halide perovskite active layers

Laura T. Schelhas; Zhen Li; Jeffrey A. Christians; Anuj Goyal; Paul Kairys; Steven P. Harvey; Dong Hoe Kim; Kevin H. Stone; Joseph M. Luther; Kai Zhu; Vladan Stevanovic; Joseph J. Berry

doi:10.1039/c8ee03051k

Insights into operational stability and processing of halide perovskite active layers

Laura T. Schelhas, Zhen Li, Jeffrey A. Christians, Anuj Goyal, Paul Kairys, Steven P. Harvey, Dong Hoe Kim, Kevin H. Stone, Joseph M. Luther, Kai Zhu, Vladan Stevanovic, Joseph J. Berry

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

117 Citations (Scopus)

Abstract

Rapid improvement of the stability of metal halide perovskite materials is required to enable their adoption for energy production at terawatt scale. To understand the role of the active layer stability in these devices we use in situ X-ray diffraction to observe the evolution in structural stability across mixed A-site APbI₃ materials where the A-site is a combination of formamidinium, Cs, and/or methylammonium. During device operation we observe spatial de-mixing and phase segregation into more pure constituent phases. Using complementary first-principles calculations of mixed A-site halide perovskites, a hypothesized framework explaining the experimentally observed mixing and de-mixing in these systems is presented and then validated using in situ X-ray diffraction and spatially resolved time of flight secondary ion mass spectrometry. Taken together, these results indicate that stability is not only a function of device architecture or chemical formulation, but that the processing strategy is critically important in synthesizing the most energetically favorable state and therefore the most stable device systems. This study reconciles disparate reports within the literature and also highlights the limitations of shelf life studies to ascertain stability as well as the importance of testing devices under operational conditions.

Original language	English
Pages (from-to)	1341-1348
Number of pages	8
Journal	Energy and Environmental Science
Volume	12
Issue number	4
DOIs	https://doi.org/10.1039/c8ee03051k
Publication status	Published - 2019 Apr
Externally published	Yes

Bibliographical note

Funding Information:
The authors wish to thank Fei Zhang for providing samples for TOF-SIMs analysis. This work was supported by the U.S. Department of Energy (DOE) Solar Energy Technology Office (SETO) of the Energy Efficiency and Renewable Energy (EERE) award for the De-risking Halide Perovskite Solar Cells project at the National Renewable Energy Laboratory under Contract No. DE-AC36-08-GO28308 managed and operated by the Alliance for Sustainable Energy, LLC. Theory portions of this research used computational resources sponsored by the DOE Office of Energy Efficiency and Renewable Energy and located at the National Renewable Energy Laboratory. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.

Funding Information:
J. A. C. was supported by the Department of Energy, Office of Energy Efficiency and Renewable Energy Postdoctoral Research Award under contract number DE-SC00014664. The views expressed in the article do not necessarily represent the views of the DOE or the U.S. Government. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for U.S. Government purposes.

Publisher Copyright:
© 2019 The Royal Society of Chemistry.

ASJC Scopus subject areas

Environmental Chemistry
Renewable Energy, Sustainability and the Environment
Nuclear Energy and Engineering
Pollution

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1039/c8ee03051k

Cite this

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title = "Insights into operational stability and processing of halide perovskite active layers",

abstract = "Rapid improvement of the stability of metal halide perovskite materials is required to enable their adoption for energy production at terawatt scale. To understand the role of the active layer stability in these devices we use in situ X-ray diffraction to observe the evolution in structural stability across mixed A-site APbI3 materials where the A-site is a combination of formamidinium, Cs, and/or methylammonium. During device operation we observe spatial de-mixing and phase segregation into more pure constituent phases. Using complementary first-principles calculations of mixed A-site halide perovskites, a hypothesized framework explaining the experimentally observed mixing and de-mixing in these systems is presented and then validated using in situ X-ray diffraction and spatially resolved time of flight secondary ion mass spectrometry. Taken together, these results indicate that stability is not only a function of device architecture or chemical formulation, but that the processing strategy is critically important in synthesizing the most energetically favorable state and therefore the most stable device systems. This study reconciles disparate reports within the literature and also highlights the limitations of shelf life studies to ascertain stability as well as the importance of testing devices under operational conditions.",

author = "Schelhas, {Laura T.} and Zhen Li and Christians, {Jeffrey A.} and Anuj Goyal and Paul Kairys and Harvey, {Steven P.} and Kim, {Dong Hoe} and Stone, {Kevin H.} and Luther, {Joseph M.} and Kai Zhu and Vladan Stevanovic and Berry, {Joseph J.}",

note = "Funding Information: The authors wish to thank Fei Zhang for providing samples for TOF-SIMs analysis. This work was supported by the U.S. Department of Energy (DOE) Solar Energy Technology Office (SETO) of the Energy Efficiency and Renewable Energy (EERE) award for the De-risking Halide Perovskite Solar Cells project at the National Renewable Energy Laboratory under Contract No. DE-AC36-08-GO28308 managed and operated by the Alliance for Sustainable Energy, LLC. Theory portions of this research used computational resources sponsored by the DOE Office of Energy Efficiency and Renewable Energy and located at the National Renewable Energy Laboratory. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. Funding Information: J. A. C. was supported by the Department of Energy, Office of Energy Efficiency and Renewable Energy Postdoctoral Research Award under contract number DE-SC00014664. The views expressed in the article do not necessarily represent the views of the DOE or the U.S. Government. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for U.S. Government purposes. Publisher Copyright: {\textcopyright} 2019 The Royal Society of Chemistry.",

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AU - Goyal, Anuj

AU - Kairys, Paul

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AU - Stone, Kevin H.

AU - Luther, Joseph M.

AU - Zhu, Kai

AU - Stevanovic, Vladan

AU - Berry, Joseph J.

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N2 - Rapid improvement of the stability of metal halide perovskite materials is required to enable their adoption for energy production at terawatt scale. To understand the role of the active layer stability in these devices we use in situ X-ray diffraction to observe the evolution in structural stability across mixed A-site APbI3 materials where the A-site is a combination of formamidinium, Cs, and/or methylammonium. During device operation we observe spatial de-mixing and phase segregation into more pure constituent phases. Using complementary first-principles calculations of mixed A-site halide perovskites, a hypothesized framework explaining the experimentally observed mixing and de-mixing in these systems is presented and then validated using in situ X-ray diffraction and spatially resolved time of flight secondary ion mass spectrometry. Taken together, these results indicate that stability is not only a function of device architecture or chemical formulation, but that the processing strategy is critically important in synthesizing the most energetically favorable state and therefore the most stable device systems. This study reconciles disparate reports within the literature and also highlights the limitations of shelf life studies to ascertain stability as well as the importance of testing devices under operational conditions.

AB - Rapid improvement of the stability of metal halide perovskite materials is required to enable their adoption for energy production at terawatt scale. To understand the role of the active layer stability in these devices we use in situ X-ray diffraction to observe the evolution in structural stability across mixed A-site APbI3 materials where the A-site is a combination of formamidinium, Cs, and/or methylammonium. During device operation we observe spatial de-mixing and phase segregation into more pure constituent phases. Using complementary first-principles calculations of mixed A-site halide perovskites, a hypothesized framework explaining the experimentally observed mixing and de-mixing in these systems is presented and then validated using in situ X-ray diffraction and spatially resolved time of flight secondary ion mass spectrometry. Taken together, these results indicate that stability is not only a function of device architecture or chemical formulation, but that the processing strategy is critically important in synthesizing the most energetically favorable state and therefore the most stable device systems. This study reconciles disparate reports within the literature and also highlights the limitations of shelf life studies to ascertain stability as well as the importance of testing devices under operational conditions.

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Insights into operational stability and processing of halide perovskite active layers

Abstract

Bibliographical note

ASJC Scopus subject areas

UN SDGs

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