Stabilizing the electroluminescence of halide perovskites with potassium passivation

Halide perovskites are of great interest for light-emitting diodes (PeLEDs) in recent years due to their excellent photo- and electroluminescence properties. However, trap/defects and ion migration of devices under high external driving voltage/current are yet overcome. In this work, it is found tha...

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Main Authors: Kanwat, Anil, Yantara, Natalia, Ng, Yan Fong, Hooper, Thomas J. N., Rana, Prem Jyoti Singh, Febriansyah, Benny, Harikesh, Padinhare Cholakkal, Salim, Teddy, Vashishtha, Parth, Mhaisalkar, Subodh Gautam, Mathews, Nripan
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/142113
https://doi.org/10.21979/N9/3IWP92
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1421132021-01-18T04:50:17Z Stabilizing the electroluminescence of halide perovskites with potassium passivation Kanwat, Anil Yantara, Natalia Ng, Yan Fong Hooper, Thomas J. N. Rana, Prem Jyoti Singh Febriansyah, Benny Harikesh, Padinhare Cholakkal Salim, Teddy Vashishtha, Parth Mhaisalkar, Subodh Gautam Mathews, Nripan School of Materials Science and Engineering Energy Research Institute @ NTU (ERI@N) Engineering::Materials Perovskite Light‐emitting Diodes Halide perovskites are of great interest for light-emitting diodes (PeLEDs) in recent years due to their excellent photo- and electroluminescence properties. However, trap/defects and ion migration of devices under high external driving voltage/current are yet 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 (~10nm) confined within the Cs4-xKxPbBr6 matrix accompanied by larger CsPbBr3 grains (~50nm) is further confirmed by high-resolution transmission electron microscopy. In addition, the kinetics of ion migration were 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 performances and stability. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Accepted version 2020-06-16T02:50:46Z 2020-06-16T02:50:46Z 2020 Journal Article Kanwat, A., Yantara, N., Ng, Y. F., Hooper, T. J. N., Rana, P. J. S., Febriansyah, B., . . . Mathews, N. (2020). Stabilizing the electroluminescence of halide perovskites with potassium passivation. ACS Energy Letters, 5(6), 1804–1813. doi:10.1021/acsenergylett.0c00553 2380-8195 https://hdl.handle.net/10356/142113 10.1021/acsenergylett.0c00553 6 5 1804 1813 en ACS Energy Letters https://doi.org/10.21979/N9/3IWP92 This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsenergylett.0c00553. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
Perovskite
Light‐emitting Diodes
spellingShingle Engineering::Materials
Perovskite
Light‐emitting Diodes
Kanwat, Anil
Yantara, Natalia
Ng, Yan Fong
Hooper, Thomas J. N.
Rana, Prem Jyoti Singh
Febriansyah, Benny
Harikesh, Padinhare Cholakkal
Salim, Teddy
Vashishtha, Parth
Mhaisalkar, Subodh Gautam
Mathews, Nripan
Stabilizing the electroluminescence of halide perovskites with potassium passivation
description Halide perovskites are of great interest for light-emitting diodes (PeLEDs) in recent years due to their excellent photo- and electroluminescence properties. However, trap/defects and ion migration of devices under high external driving voltage/current are yet 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 (~10nm) confined within the Cs4-xKxPbBr6 matrix accompanied by larger CsPbBr3 grains (~50nm) is further confirmed by high-resolution transmission electron microscopy. In addition, the kinetics of ion migration were 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 performances and stability.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Kanwat, Anil
Yantara, Natalia
Ng, Yan Fong
Hooper, Thomas J. N.
Rana, Prem Jyoti Singh
Febriansyah, Benny
Harikesh, Padinhare Cholakkal
Salim, Teddy
Vashishtha, Parth
Mhaisalkar, Subodh Gautam
Mathews, Nripan
format Article
author Kanwat, Anil
Yantara, Natalia
Ng, Yan Fong
Hooper, Thomas J. N.
Rana, Prem Jyoti Singh
Febriansyah, Benny
Harikesh, Padinhare Cholakkal
Salim, Teddy
Vashishtha, Parth
Mhaisalkar, Subodh Gautam
Mathews, Nripan
author_sort Kanwat, Anil
title Stabilizing the electroluminescence of halide perovskites with potassium passivation
title_short Stabilizing the electroluminescence of halide perovskites with potassium passivation
title_full Stabilizing the electroluminescence of halide perovskites with potassium passivation
title_fullStr Stabilizing the electroluminescence of halide perovskites with potassium passivation
title_full_unstemmed Stabilizing the electroluminescence of halide perovskites with potassium passivation
title_sort stabilizing the electroluminescence of halide perovskites with potassium passivation
publishDate 2020
url https://hdl.handle.net/10356/142113
https://doi.org/10.21979/N9/3IWP92
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