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A 2D Titanium Carbide MXene Flexible Electrode for High-Efficiency Light-Emitting Diodes

Cited 62 time in Web of Science Cited 60 time in Scopus
Issue Date
2020-06
Citation
Advanced Materials, Vol.32 No.23, p. 2000919
Keywords
flexible electrodesflexible light-emitting diodesMXenesurface engineeringtitanium carbide
Abstract
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimAlthough several transparent conducting materials such as carbon nanotubes, graphene, and conducting polymers have been intensively explored as flexible electrodes in optoelectronic devices, their insufficient electrical conductivity, low work function, and complicated electrode fabrication processes have limited their practical use. Herein, a 2D titanium carbide (Ti3C2) MXene film with transparent conducting electrode (TCE) properties, including high electrical conductivity (≈11 670 S cm−1) and high work function (≈5.1 eV), which are achieved by combining a simple solution processing with modulation of surface composition, is described. A chemical neutralization strategy of a conducting-polymer hole-injection layer is used to prevent detrimental surface oxidation and resulting degradation of the electrode film. Use of the MXene electrode in an organic light-emitting diode leads to a current efficiency of ≈102.0 cd A−1 and an external quantum efficiency of ≈28.5% ph/el, which agree well with the theoretical maximum values from optical simulations. The results demonstrate the strong potential of MXene as a solution-processable electrode in optoelectronic devices and provide a guideline for use of MXenes as TCEs in low-cost flexible optoelectronic devices.
ISSN
0935-9648
URI
https://hdl.handle.net/10371/171782
DOI
https://doi.org/10.1002/adma.202000919
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Journal Papers (저널논문_재료공학부)
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