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

Soyeong Ahn, Tae Hee Han, Kathleen Maleski, Jinouk Song, Young Hoon Kim, Min Ho Park, Huanyu Zhou, Seunghyup Yoo, Yury Gogotsi, Tae Woo Lee

Research output: Contribution to journalArticle

Abstract

Although 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.

Original languageEnglish
Article number2000919
JournalAdvanced Materials
Volume32
Issue number23
DOIs
StatePublished - 2020 Jun 1

Keywords

  • MXene
  • flexible electrodes
  • flexible light-emitting diodes
  • surface engineering
  • titanium carbide

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    Ahn, S., Han, T. H., Maleski, K., Song, J., Kim, Y. H., Park, M. H., Zhou, H., Yoo, S., Gogotsi, Y., & Lee, T. W. (2020). A 2D Titanium Carbide MXene Flexible Electrode for High-Efficiency Light-Emitting Diodes. Advanced Materials, 32(23), [2000919]. https://doi.org/10.1002/adma.202000919