Solution-processed titanium carbide MXene films examined as highly transparent conductors

Area of Science:

• Materials Science
• Nanotechnology
• Condensed Matter Physics

Background:

• MXenes represent a novel class of two-dimensional materials with exceptional physical properties.
• Transparent conductors are crucial for various electronic applications, including displays and solar cells.
• Reduced graphene oxide (rGO) is a common material for transparent conductors, but often faces limitations.

Purpose of the Study:

• To introduce delaminated Ti3C2Tx MXene monolayers as ultrathin transparent conductors.
• To evaluate their properties in comparison to reduced graphene oxide films.
• To explore their potential for next-generation transparent conductive electrodes.

Main Methods:

• Solution processing of Ti3C2Tx delaminated monolayers.
• Sheet resistance and optical transmittance measurements at 550 nm.
• Field-effect transistor measurements to confirm metallic nature.
• Kelvin Probe Atomic Force Microscopy (KPFM) to determine work function.

Main Results:

• Solution-processed Ti3C2Tx films achieved sheet resistances as low as 437 Ω sq-1 with 77% transmittance at 550 nm.
• Films exhibited metallic behavior, suitable for electrode applications.
• Delaminated Ti3C2Tx flakes (with OH terminal groups) showed a work function of 5.28 ± 0.03 eV.
• Performance exceeded that of comparable reduced graphene oxide films.

Conclusions:

• Ti3C2Tx delaminated monolayers are promising ultrathin transparent conductors.
• Solution processing enables efficient fabrication of these materials.
• Their properties suggest significant potential for next-generation transparent conductive electrodes.