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| Electrical switching and charge oscillation in VO2 micro-channel devices |
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| Content: |
Stoichiometric vanadium dioxide (VO2) undergoes a metal-to-insulator phase transition (MIT) at ~68°C temperature. This is accompanied by a pronounced decrease in electrical resistivity. This phase change can also be achieved with the application of an external electric field or by optical excitation. In this work we demonstrate the electrical switching characteristics, hysteresis and negative differential resistance (NDR) of VO2 material when incorporated into micro-channel devices. We designed, fabricated and tested planar VO2 micro-channel devices on sapphire(c-cut) with different channel dimensions using standard photolithography and lift-off techniques. These micro-channels exhibit self-sustained charge oscillations when connected to dc power source and does not require any external capacitive or inductive components. We demonstrate that the oscillation frequency of the investigated devices can be systematically tuned using an external laser source focused on the VO2 micro-channels. We quantitatively studied the mechanism of this oscillation and explain its origin as a consequence of NDR and changing resistivity of the channel. |
| Id: |
9 |
| Place: |
Science Building Texas Tech University, Physics & Astronomy Department, Box 41051, Lubbock, TX 79409-1051
Room: 103/106 - board #: G2-2 |
| Starting date: |
| 06-Oct-2017 |
14:00 (America/Chicago) |
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| Duration: |
02h00' |
| Primary Authors: |
Mr. PATTANAYAK, Milinda (Department of Physics, Nano Tech Center, Texas Tech University) |
| Co-Authors: |
Dr. HOQUE, Md Nadim Ferdous (Department of Electrical and Computer Engineering, Nano Tech Center, Texas Tech University)
Dr. FAN, Zhaoyang (Department of Electrical and Computer Engineering, Nano Tech Center, Texas Tech University,)
Dr. BERNUSSI, Ayrton (Department of Electrical and Computer Engineering, Nano Tech Center, Texas Tech University) |
| Presenters: |
Mr. PATTANAYAK, Milinda |
| Material: |
 Poster |
| Included in session: |
Group 2 |
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