Role of Decomposition Product Ions in Hysteretic Behavior of Metal Halide Perovskite

Yongtao Liu; Nikolay Borodinov; Liam Collins; Mahshid Ahmadi; Sergei V. Kalinin; Olga S. Ovchinnikova; Anton V. Ievlev

doi:10.1021/acsnano.1c02097

Role of Decomposition Product Ions in Hysteretic Behavior of Metal Halide Perovskite

Yongtao Liu, Nikolay Borodinov, Liam Collins, Mahshid Ahmadi, Sergei V. Kalinin, Olga S. Ovchinnikova, Anton V. Ievlev

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

14 Scopus citations

Abstract

Ion migration is one of the most debated mechanisms and credited with multiple observed phenomena and performance in metal halide perovskites (MHPs) semiconductor devices. However, to date, the migration of ions and their effects on MHPs are not still fully understood, largely due to a lack of direct observations of temporal ion migration. In this work, using direct observation of ion migration in-operando, we observe the hysteretic migration behavior of intrinsic ions (i.e., CH3NH3+ and I-) as well as reveal the migration behavior of CH3NH3+ decomposition ions. We find that CH3NH3+ decomposition products can be affected by light and accumulate at the interfaces under bias. These MHP decomposition products are tightly related to the device performance and stability. Complementary results of time-resolved Kelvin probe force microscopy (tr-KPFM) demonstrate a correlation between dynamics of these interfacial ions and charge carriers. Overall, we find that there are a number of mobile ions including CH3NH3+ decomposition products in MHPs that need to be taken into account when measuring MHP device responses (e.g., charge dynamics) and should be considered in future optimization studies of MHP semiconductor devices.

Original language	English
Pages (from-to)	9017-9026
Number of pages	10
Journal	ACS Nano
Volume	15
Issue number	5
DOIs	https://doi.org/10.1021/acsnano.1c02097
State	Published - May 25 2021

Funding

This research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility, and using instrumentation within ORNL’s Materials Characterization Core provided by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.

Funders	Funder number
U.S. Department of Energy
Office of Science
UT-Battelle	DE-AC05-00OR22725

Keywords

cation
charge carriers
decomposition
hysteretic
interfacial ions
ion migration
metal halide perovskites

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10.1021/acsnano.1c02097

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title = "Role of Decomposition Product Ions in Hysteretic Behavior of Metal Halide Perovskite",

abstract = "Ion migration is one of the most debated mechanisms and credited with multiple observed phenomena and performance in metal halide perovskites (MHPs) semiconductor devices. However, to date, the migration of ions and their effects on MHPs are not still fully understood, largely due to a lack of direct observations of temporal ion migration. In this work, using direct observation of ion migration in-operando, we observe the hysteretic migration behavior of intrinsic ions (i.e., CH3NH3+ and I-) as well as reveal the migration behavior of CH3NH3+ decomposition ions. We find that CH3NH3+ decomposition products can be affected by light and accumulate at the interfaces under bias. These MHP decomposition products are tightly related to the device performance and stability. Complementary results of time-resolved Kelvin probe force microscopy (tr-KPFM) demonstrate a correlation between dynamics of these interfacial ions and charge carriers. Overall, we find that there are a number of mobile ions including CH3NH3+ decomposition products in MHPs that need to be taken into account when measuring MHP device responses (e.g., charge dynamics) and should be considered in future optimization studies of MHP semiconductor devices.",

keywords = "cation, charge carriers, decomposition, hysteretic, interfacial ions, ion migration, metal halide perovskites",

author = "Yongtao Liu and Nikolay Borodinov and Liam Collins and Mahshid Ahmadi and Kalinin, {Sergei V.} and Ovchinnikova, {Olga S.} and Ievlev, {Anton V.}",

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AU - Liu, Yongtao

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AU - Collins, Liam

AU - Ahmadi, Mahshid

AU - Kalinin, Sergei V.

AU - Ovchinnikova, Olga S.

AU - Ievlev, Anton V.

PY - 2021/5/25

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N2 - Ion migration is one of the most debated mechanisms and credited with multiple observed phenomena and performance in metal halide perovskites (MHPs) semiconductor devices. However, to date, the migration of ions and their effects on MHPs are not still fully understood, largely due to a lack of direct observations of temporal ion migration. In this work, using direct observation of ion migration in-operando, we observe the hysteretic migration behavior of intrinsic ions (i.e., CH3NH3+ and I-) as well as reveal the migration behavior of CH3NH3+ decomposition ions. We find that CH3NH3+ decomposition products can be affected by light and accumulate at the interfaces under bias. These MHP decomposition products are tightly related to the device performance and stability. Complementary results of time-resolved Kelvin probe force microscopy (tr-KPFM) demonstrate a correlation between dynamics of these interfacial ions and charge carriers. Overall, we find that there are a number of mobile ions including CH3NH3+ decomposition products in MHPs that need to be taken into account when measuring MHP device responses (e.g., charge dynamics) and should be considered in future optimization studies of MHP semiconductor devices.

AB - Ion migration is one of the most debated mechanisms and credited with multiple observed phenomena and performance in metal halide perovskites (MHPs) semiconductor devices. However, to date, the migration of ions and their effects on MHPs are not still fully understood, largely due to a lack of direct observations of temporal ion migration. In this work, using direct observation of ion migration in-operando, we observe the hysteretic migration behavior of intrinsic ions (i.e., CH3NH3+ and I-) as well as reveal the migration behavior of CH3NH3+ decomposition ions. We find that CH3NH3+ decomposition products can be affected by light and accumulate at the interfaces under bias. These MHP decomposition products are tightly related to the device performance and stability. Complementary results of time-resolved Kelvin probe force microscopy (tr-KPFM) demonstrate a correlation between dynamics of these interfacial ions and charge carriers. Overall, we find that there are a number of mobile ions including CH3NH3+ decomposition products in MHPs that need to be taken into account when measuring MHP device responses (e.g., charge dynamics) and should be considered in future optimization studies of MHP semiconductor devices.

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Role of Decomposition Product Ions in Hysteretic Behavior of Metal Halide Perovskite

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