Verbel Márquez, Camilo Andrés

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    Transition-metal oxides for electrical and high frequencies applications
    (2024-07-10) Verbel Márquez, Camilo Andrés; Rodríguez Solís, Rafael; College of Engineering; Rúa, Armando; Medina, Rafael; León, Leyda; Department of Electrical and Computer Engineering; Pérez Muñoz, Fernando
    The study focused on investigating the properties of vanadium oxide (V3O5, VO2 and V4O7) thin films deposited via DC magnetron sputtering on SiO2 and SiO2/Si(100) substrates. The research covered structural, electrical, optical, morphological, and mechanical aspects of these materials. Firstly, V3O5 demonstrated intriguing electrical properties, including a phase transition near 420 K with a order of magnitude change in electrical conductivity, studied using the Van der Pauw technique. A planar device of V3O5 exhibited free-electroforming threshold switching and negative differential resistance, possibly due to localized Joule heating effects. Furthermore, Young's modulus of V3O5 was found close to 195 GPa. High-frequency characteristics were determined for the first time in V3O5 in the frequency range from 5 to 35 GHz. The S-parameters showed that the S11 at low temperature was close to -1.5 dB, and the S21 was approximately -50 dB. At high temperature, the S21 to around -40 dB at 35 GHz. For S11 and S22, similar behavior was observed as at low temperature, with a notable change in the Phase of the device. Also, V3O5 was explored in antenna applications, demonstrating frequency-selective behavior at different temperatures. In collaboration with The Australian National University, optical and biometric thermosensitive properties of V3O5 were studied. It revealed that can undergo electrical switching under exposure to different wavelengths, indicating its photoconductive, bolometric properties and suitability for neuromorphic device applications. Lastly, optical properties of V4O7 were investigated using photoinduced ultrafast methods, revealing nonlinear responses in both metallic and insulating phases.