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Quantitative Study of Reversible Nonvolatile VO2 Thin Films Through Plasma Driven Phase Engineering Process.

Samiksha Bajaj1, Shang-Jui Chiu2, Jia Wei Chen3

  • 1Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 300, Taiwan.

Small (Weinheim an Der Bergstrasse, Germany)
|February 12, 2025
PubMed
Summary
This summary is machine-generated.

Plasma irradiation controls vanadium dioxide (VO2) phase transitions for nanoelectronics. Argon plasma creates tunable phases (M1, M1-R, R) with distinct resistive states, enabling stable room-temperature device applications.

Keywords:
monoclinicmonoclinic‐tetragonal rutilephase engineeringplasma irradiationvanadium dioxide

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Nanoscale control of phase transitions in correlated materials is crucial for advanced nanoelectronics.
  • Vanadium dioxide (VO2) exhibits a temperature-driven metal-insulator transition, making it a candidate for electronic applications.

Purpose of the Study:

  • To investigate the phase transition phenomenon in VO2 thin films induced by low-pressure plasma irradiation.
  • To explore the formation of heterogeneous phases and their resistive states at room temperature.

Main Methods:

  • Thin films of VO2 were irradiated with Argon (Ar) plasma at varying power levels.
  • High-resolution transmission electron microscopy (HRTEM) was used to analyze phase structures and interplanar spacing.
  • Dielectric force microscopy (DFM) was employed to characterize the dielectric responses of different phases.

Main Results:

  • Plasma power modulation led to the formation of homogeneous (M1, R) and heterogeneous (M1-R) phases.
  • HRTEM revealed distinct phases: monoclinic (M1) at 0W, phase coexistence (M1-R) at 50W, and tetragonal rutile (R) at 90W.
  • DFM showed unique dielectric responses for each phase (3 mV for M1, 5 mV for M1-R, 7.44 mV for R), with stabilized M1-R phase at room temperature.

Conclusions:

  • Argon plasma irradiation effectively controls and stabilizes VO2 phases, including the coexistence M1-R phase, at room temperature.
  • The observed reversible phase changes and stable resistive states are promising for nanoelectronic device applications.
  • Plasma geometry modifications can stabilize previously unstable phases, expanding possibilities for future nanoelectronic designs.