| Title |
Bidirectional Current Triggering in Two-Terminal Planar Device Based on Vanadium Dioxide Thin Film Using 1550nm Laser Diode |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2015.29.4.011 |
| Keywords |
Vanadium Dioxide ; Thin Film ; Planar Device ; Phase Transition ; Laser Triggering |
| Abstract |
While most switching devices are based on PN junctions, a single layer can realize a switching device in the case of vanadium dioxide(VO2) thin films. In this paper, bidirectional current triggering(switching) is demonstrated in a two-terminal planar device based on a VO2 thin film by illuminating the film with an infrared laser at 1550nm. To begin with, a two-terminal planar device, which had a 30μm-wide VO2 conducting layer and an electrode separation of 10μm, was fabricated. A specific bias voltage range for stable bidirectional laser triggering was experimentally obtained by measuring the current-voltage characteristics of the fabricated device in a current-controlled mode. Then, by constructing a test circuit composed of the device, a standard resistor, and a DC voltage source, connected in series, the transient response of laser-triggered current and its response time were investigated with a DC bias voltage, included in the above specific bias voltage range, applied to the device. In the test circuit with a DC voltage source of 3.35V and a 10Ω resistor, bidirectional laser triggering could be realized with a maximum on-state current of 15mA and a switching contrast of ∼ 78.95. |