Please use this identifier to cite or link to this item:
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.
ISSN: 2380-8195
DOI: 10.1021/acsenergylett.0c00553
DOI (Related Dataset):
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
Fulltext Permission: embargo_20210619
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
MSE Journal Articles

Files in This Item:
File Description SizeFormat 
Stabilizing the Electroluminescence of Halide Perovskites with Potassium Passivation.pdf
  Until 2021-06-19
9.32 MBAdobe PDFUnder embargo until Jun 19, 2021

Citations 20

Updated on Apr 21, 2021

Citations 20

Updated on Apr 23, 2021

Page view(s)

Updated on May 11, 2021

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.