Direct Observation of Photoinduced Ion Migration in Lead Halide Perovskites

Yongtao Liu; Anton V. Ievlev; Nikolay Borodinov; Matthias Lorenz; Kai Xiao; Mahshid Ahmadi; Bin Hu; Sergei V. Kalinin; Olga S. Ovchinnikova

doi:10.1002/adfm.202008777

Direct Observation of Photoinduced Ion Migration in Lead Halide Perovskites

Yongtao Liu, Anton V. Ievlev, Nikolay Borodinov, Matthias Lorenz, Kai Xiao, Mahshid Ahmadi, Bin Hu, Sergei V. Kalinin, Olga S. Ovchinnikova

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

49 Scopus citations

Abstract

Unique optoelectronic, electronic, and sensing properties of hybrid organic–inorganic perovskites (HOIPs) are underpinned by the complex interactions between electronic and ionic states. Here, the photoinduced field ion migration in HOIPs is directly observed. Using newly developed local probe time-resolved techniques, more significant CH₃NH₃⁺ migration than I⁻/Br⁻ migration in HOIPs is unveiled. It is found that light illumination only induces CH₃NH₃⁺ migration but not I⁻/Br⁻ migration. By directly observing temporal changes in bias-induced and photoinduced ion migration in device conditions, it is revealed that light illumination suppresses the bias-induced ion redistribution in the lateral device. These findings, being a necessary compensation of previous understandings of ion migration in HOIPs based on simulations and static and/or indirect measurements, offer advanced insights into the distinct light effects on the migration of organic cation and halides in HOIPs, which are expected to be helpful for improving the performance and the long-term stability of HOIPs optoelectronics.

Original language	English
Article number	2008777
Journal	Advanced Functional Materials
Volume	31
Issue number	8
DOIs	https://doi.org/10.1002/adfm.202008777
State	Published - Feb 17 2021

Funding

This research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This research was supported by Center for Nanophase Materials Sciences at Oak Ridge National Laboratory (O.S.O., S.V.K., K.X., A.V.I., and Y.L.). The research was partially sponsored from Air Force Office of Scientific Research (AFOSR) under the grant number FA 9550‐15‐1‐0064, AOARD (FA2386‐15‐1‐4104), and National Science Foundation CBET‐1438181 (B.H.). The authors thank the Center for Materials Processing, a Center of Excellence at the University of Tennessee Higher Education Commission, for financial support (B.H.). This research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This research was supported by Center for Nanophase Materials Sciences at Oak Ridge National Laboratory (O.S.O., S.V.K., K.X., A.V.I., and Y.L.). The research was partially sponsored from Air Force Office of Scientific Research (AFOSR) under the grant number FA 9550-15-1-0064, AOARD (FA2386-15-1-4104), and National Science Foundation CBET-1438181 (B.H.). The authors thank the Center for Materials Processing, a Center of Excellence at the University of Tennessee Higher Education Commission, for financial support (B.H.).

Funders	Funder number
Center for Nanophase Materials Sciences
University of Tennessee Higher Education Commission
National Science Foundation	CBET‐1438181
Air Force Office of Scientific Research	FA2386‐15‐1‐4104, FA 9550‐15‐1‐0064
Office of Science
Oak Ridge National Laboratory
Tennessee Higher Education Commission

Keywords

cation migration
ion migration
lead halide perovskite
light illumination

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10.1002/adfm.202008777

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title = "Direct Observation of Photoinduced Ion Migration in Lead Halide Perovskites",

abstract = "Unique optoelectronic, electronic, and sensing properties of hybrid organic–inorganic perovskites (HOIPs) are underpinned by the complex interactions between electronic and ionic states. Here, the photoinduced field ion migration in HOIPs is directly observed. Using newly developed local probe time-resolved techniques, more significant CH3NH3+ migration than I−/Br− migration in HOIPs is unveiled. It is found that light illumination only induces CH3NH3+ migration but not I−/Br− migration. By directly observing temporal changes in bias-induced and photoinduced ion migration in device conditions, it is revealed that light illumination suppresses the bias-induced ion redistribution in the lateral device. These findings, being a necessary compensation of previous understandings of ion migration in HOIPs based on simulations and static and/or indirect measurements, offer advanced insights into the distinct light effects on the migration of organic cation and halides in HOIPs, which are expected to be helpful for improving the performance and the long-term stability of HOIPs optoelectronics.",

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author = "Yongtao Liu and Ievlev, {Anton V.} and Nikolay Borodinov and Matthias Lorenz and Kai Xiao and Mahshid Ahmadi and Bin Hu and Kalinin, {Sergei V.} and Ovchinnikova, {Olga S.}",

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AU - Ahmadi, Mahshid

AU - Hu, Bin

AU - Kalinin, Sergei V.

AU - Ovchinnikova, Olga S.

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N2 - Unique optoelectronic, electronic, and sensing properties of hybrid organic–inorganic perovskites (HOIPs) are underpinned by the complex interactions between electronic and ionic states. Here, the photoinduced field ion migration in HOIPs is directly observed. Using newly developed local probe time-resolved techniques, more significant CH3NH3+ migration than I−/Br− migration in HOIPs is unveiled. It is found that light illumination only induces CH3NH3+ migration but not I−/Br− migration. By directly observing temporal changes in bias-induced and photoinduced ion migration in device conditions, it is revealed that light illumination suppresses the bias-induced ion redistribution in the lateral device. These findings, being a necessary compensation of previous understandings of ion migration in HOIPs based on simulations and static and/or indirect measurements, offer advanced insights into the distinct light effects on the migration of organic cation and halides in HOIPs, which are expected to be helpful for improving the performance and the long-term stability of HOIPs optoelectronics.

AB - Unique optoelectronic, electronic, and sensing properties of hybrid organic–inorganic perovskites (HOIPs) are underpinned by the complex interactions between electronic and ionic states. Here, the photoinduced field ion migration in HOIPs is directly observed. Using newly developed local probe time-resolved techniques, more significant CH3NH3+ migration than I−/Br− migration in HOIPs is unveiled. It is found that light illumination only induces CH3NH3+ migration but not I−/Br− migration. By directly observing temporal changes in bias-induced and photoinduced ion migration in device conditions, it is revealed that light illumination suppresses the bias-induced ion redistribution in the lateral device. These findings, being a necessary compensation of previous understandings of ion migration in HOIPs based on simulations and static and/or indirect measurements, offer advanced insights into the distinct light effects on the migration of organic cation and halides in HOIPs, which are expected to be helpful for improving the performance and the long-term stability of HOIPs optoelectronics.

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Direct Observation of Photoinduced Ion Migration in Lead Halide Perovskites

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Keywords

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