| Title |
Study on Current Switching in Electronic Devices Based on Vanadium Dioxide Thin Films Using CO2 Laser |
| Authors |
Jihoon Kim ; Yong Wook Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2016.30.1.001 |
| Keywords |
Vanadium dioxide ; Thin film ; Metal-insulator transition ; Switching ; CO2 laser |
| Abstract |
With a collimated CO2 laser beam, the bidirectional current switching was realized in a two-terminal electronic device based on a highly resistive vanadium dioxide(VO2) thin film. A VO2 thin film was grown on a Al2O3 substrate by a pulsed laser deposition method. For the fabrication of a two-terminal electronic device, the VO2 thin film was etched by an ion beam-assisted milling method, and the VO2 device, of which VO2 patch width and electrode separation were 50 and 100μm, respectively, was fabricated through a photolithographic method. A bias voltage range for stable bidirectional current switching was found by using the current-voltage property of the device measured in a current-controlled mode. The transient responses of bidirectionally switched currents were analyzed when the laser was modulated at a variety of pulse widths and repetition rates. A switching contrast was measured as ∼3333, and rising and falling times were measured as ∼39 and ∼21ms, respectively. |