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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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 |
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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 |
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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. |
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School of Materials Science and Engineering |
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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 |
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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 |
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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 |
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2020 |
url |
https://hdl.handle.net/10356/142113 https://doi.org/10.21979/N9/3IWP92 |
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1690658346857660416 |