Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/142113
Title: Stabilizing the electroluminescence of halide perovskites with potassium passivation
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
Keywords: Engineering::Materials
Issue Date: 2020
Source: 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
Journal: ACS Energy Letters 
Abstract: 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.
URI: https://hdl.handle.net/10356/142113
ISSN: 2380-8195
DOI: 10.1021/acsenergylett.0c00553
DOI (Related Dataset): https://doi.org/10.21979/N9/3IWP92
Rights: 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.
Fulltext Permission: embargo_20210619
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
MSE Journal Articles

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