Stabilizing the Electroluminescence of Halide Perovskites with Potassium Passivation

Anil Kanwat; Natalia Yantara; Yan Fong Ng; Yan Fong Ng; Thomas J.N. Hooper; Prem Jyoti Singh Rana; Benny Febriansyah; Padinhare Cholakkal Harikesh; Teddy Salim; Parth Vashishtha; Subodh G. Mhaisalkar; Nripan Mathews

doi:10.1021/acsenergylett.0c00553

Stabilizing the Electroluminescence of Halide Perovskites with Potassium Passivation

Anil Kanwat, Natalia Yantara, Yan Fong Ng, Yan Fong Ng, Thomas J.N. Hooper, Prem Jyoti Singh Rana, Benny Febriansyah, Padinhare Cholakkal Harikesh, Teddy Salim, Parth Vashishtha, Subodh G. Mhaisalkar, Nripan Mathews^*

^*Corresponding author for this work

Nanyang Technological University

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

42 Citations (Scopus)

Abstract

Halide perovskites have been of great interest for light-emitting diodes (PeLEDs) in recent years because of their excellent photo- and electroluminescence properties. However, traps/defects and ion migration in devices under high external driving voltage or current are yet to be overcome. In this work, it is found that upon potassium (K) addition to a CsPbBr3/Cs4PbBr6 (3D:0D = 0.85:0.15) perovskite, a locally disordered 0D Cs4-xKxPbBr6 phase is formed with nearly 0.35:0.65 admixture of 0D:3D, along with an unreacted KBr phase potentially passivating the surface and grain boundaries. The formation of CsPbBr3 nanocrystals (∼10 nm) confined within the Cs4-xKxPbBr6 matrix accompanied by larger CsPbBr3 grains (∼50 nm) is further confirmed by high-resolution transmission electron microscopy. In addition, the kinetics of ion migration was characterized with Auger electron spectroscopy and double-layer polarization using capacitive-frequency measurements, revealing significantly lower hysteresis, halide ion migration, and accumulation for the K-incorporated samples during device operation, resulting in substantial improvements in LED performance and stability.

Original language	English
Pages (from-to)	1804-1813
Number of pages	10
Journal	ACS Energy Letters
Volume	5
Issue number	6
DOIs	https://doi.org/10.1021/acsenergylett.0c00553
Publication status	Published - Jun 12 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2020 American Chemical Society.

ASJC Scopus Subject Areas

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

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

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10.1021/acsenergylett.0c00553

Cite this

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title = "Stabilizing the Electroluminescence of Halide Perovskites with Potassium Passivation",

abstract = "Halide perovskites have been of great interest for light-emitting diodes (PeLEDs) in recent years because of their excellent photo- and electroluminescence properties. However, traps/defects and ion migration in devices under high external driving voltage or current are yet to be overcome. In this work, it is found that upon potassium (K) addition to a CsPbBr3/Cs4PbBr6 (3D:0D = 0.85:0.15) perovskite, a locally disordered 0D Cs4-xKxPbBr6 phase is formed with nearly 0.35:0.65 admixture of 0D:3D, along with an unreacted KBr phase potentially passivating the surface and grain boundaries. The formation of CsPbBr3 nanocrystals (∼10 nm) confined within the Cs4-xKxPbBr6 matrix accompanied by larger CsPbBr3 grains (∼50 nm) is further confirmed by high-resolution transmission electron microscopy. In addition, the kinetics of ion migration was characterized with Auger electron spectroscopy and double-layer polarization using capacitive-frequency measurements, revealing significantly lower hysteresis, halide ion migration, and accumulation for the K-incorporated samples during device operation, resulting in substantial improvements in LED performance and stability.",

author = "Anil Kanwat and Natalia Yantara and Ng, {Yan Fong} and Ng, {Yan Fong} and Hooper, {Thomas J.N.} and Rana, {Prem Jyoti Singh} and Benny Febriansyah and Harikesh, {Padinhare Cholakkal} and Teddy Salim and Parth Vashishtha and Mhaisalkar, {Subodh G.} and Nripan Mathews",

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AU - Kanwat, Anil

AU - Yantara, Natalia

AU - Ng, Yan Fong

AU - Hooper, Thomas J.N.

AU - Rana, Prem Jyoti Singh

AU - Febriansyah, Benny

AU - Harikesh, Padinhare Cholakkal

AU - Salim, Teddy

AU - Vashishtha, Parth

AU - Mhaisalkar, Subodh G.

AU - Mathews, Nripan

PY - 2020/6/12

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AB - Halide perovskites have been of great interest for light-emitting diodes (PeLEDs) in recent years because of their excellent photo- and electroluminescence properties. However, traps/defects and ion migration in devices under high external driving voltage or current are yet to be overcome. In this work, it is found that upon potassium (K) addition to a CsPbBr3/Cs4PbBr6 (3D:0D = 0.85:0.15) perovskite, a locally disordered 0D Cs4-xKxPbBr6 phase is formed with nearly 0.35:0.65 admixture of 0D:3D, along with an unreacted KBr phase potentially passivating the surface and grain boundaries. The formation of CsPbBr3 nanocrystals (∼10 nm) confined within the Cs4-xKxPbBr6 matrix accompanied by larger CsPbBr3 grains (∼50 nm) is further confirmed by high-resolution transmission electron microscopy. In addition, the kinetics of ion migration was characterized with Auger electron spectroscopy and double-layer polarization using capacitive-frequency measurements, revealing significantly lower hysteresis, halide ion migration, and accumulation for the K-incorporated samples during device operation, resulting in substantial improvements in LED performance and stability.

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Stabilizing the Electroluminescence of Halide Perovskites with Potassium Passivation

Abstract

Bibliographical note

ASJC Scopus Subject Areas

UN SDGs

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