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Sensitive THz Detection by Using Thermoresistive Effect in 2D Vanadium Dioxide.

Shengnan Yan1, Qiangqiang Wu2, Xiunan Yan1

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Summary

Single-crystalline, two-dimensional vanadium dioxide (VO2(B)) demonstrates a hysteresis-free, linear thermoresistive response, overcoming limitations of traditional materials. This breakthrough enables sensitive terahertz (THz) detection with advanced thermal sensors.

Keywords:
2D vanadium dioxideTHz bolometerroom-temperature THz detectiontemperature coefficient of resistancethermoresistive effect

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Thermoresistive effect is key for thermal sensors, but often limited by hysteresis and nonlinearity from metal-insulator transitions (MITs).
  • Vanadium dioxide (VO2) is a common material exhibiting MIT, causing performance issues in sensors.
  • Two-dimensional (2D) materials offer unique properties due to quantum confinement and high surface area.

Purpose of the Study:

  • To investigate the thermoresistive properties of single-crystalline, 2D vanadium dioxide in its bronze phase (VO2(B)).
  • To assess the potential of 2D VO2(B) for sensitive terahertz (THz) detection applications.
  • To understand the mechanism behind the suppressed MIT in 2D VO2(B).

Main Methods:

  • Synthesis of single-crystalline, 2D VO2(B) material.
  • Fabrication of devices for electrical transport measurements.
  • Characterization of thermoresistive response, including linearity and hysteresis.
  • Performance evaluation of a THz microbolometer based on 2D VO2(B).

Main Results:

  • 2D VO2(B) exhibits a hysteresis-free and highly linear thermoresistive response.
  • The metal-insulator transition (MIT) is suppressed in 2D VO2(B), likely due to inhibited vanadium-vanadium dimerization.
  • Achieved electrical conductivity of 4.24 × 10^-3 Ω·cm and a temperature coefficient of resistance (TCR) of ~4.0%/K.
  • A THz microbolometer demonstrated a noise equivalent power of 722 pW/√Hz and a response time of ~109 μs at room temperature.

Conclusions:

  • 2D VO2(B) is a promising material for high-performance thermal detection, particularly for THz applications.
  • The suppressed MIT in 2D VO2(B) overcomes key limitations of conventional thermoresistive materials.
  • This work opens avenues for developing advanced sensors with improved sensitivity and linearity.