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First-principles study of a MXene terahertz detector.

Y I Jhon1, M Seo, Y M Jhon

  • 1Sensor System Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea. ymjhon@kist.re.kr.

Nanoscale
|December 2, 2017
PubMed
Summary

Two-dimensional transition metal carbides (MXenes) show great potential for terahertz detection. Ti3C2 MXenes exhibit strong terahertz absorption and thermoelectric properties, making them suitable for advanced detectors.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials like MXenes possess unique electronic and optical properties.
  • MXenes are transition metal carbides, nitrides, and carbonitrides with diverse applications.
  • Terahertz (THz) technology requires novel materials for efficient detection.

Purpose of the Study:

  • To investigate the potential of MXenes as terahertz detecting materials.
  • To analyze the optical and thermoelectric properties of MXenes in the terahertz range.
  • To explore MXenes for applications in terahertz bolometers and photothermoelectric detectors.

Main Methods:

  • Systematic density functional theory (DFT) calculations were performed.
  • Optical absorption and extinction coefficients in the terahertz range were analyzed.

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  • Thermoelectric figure of merit (ZT) was evaluated for stacked Ti3C2 flakes.

    • Main Results:

    • MXenes, particularly Ti3C2, exhibit giant optical absorption and extinction coefficients in the terahertz range.
    • The THz optical response of Ti3C2 is independent of its stacking degree.
    • Stacked Ti3C2 flakes show a thermoelectric figure of merit comparable to carbon nanotube films.

    Conclusions:

    • MXenes demonstrate excellent terahertz absorption and thermoelectric efficiency.
    • MXenes are promising candidates for terahertz detection applications.
    • Further improvements in ZT can be achieved using large-scale MXene films or composites.