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A 2D Titanium Carbide MXene Flexible Electrode for High‐Efficiency Light‐Emitting Diodes
Author(s) -
Ahn Soyeong,
Han TaeHee,
Maleski Kathleen,
Song Jinouk,
Kim YoungHoon,
Park MinHo,
Zhou Huanyu,
Yoo Seunghyup,
Gogotsi Yury,
Lee TaeWoo
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202000919
Subject(s) - materials science , electrode , optoelectronics , mxenes , titanium carbide , graphene , work function , carbon nanotube , diode , nanotechnology , layer (electronics) , carbide , composite material , chemistry
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 (Ti 3 C 2 ) 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.