| Title |
Bidirectional Current Triggering in Two-Terminal Planar Device Based on Highly Resistive Vanadium Dioxide Thin Film Using 966nm Near Infrared Laser |
| Authors |
Jihoon Kim ; Yong Wook Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2015.29.11.028 |
| Keywords |
Vanadium Dioxide ; Thin Film ; Metal-Insulator Transition ; Photothermal Effect ; Switching |
| Abstract |
By incorporating a 966nm near infrared laser, we demonstrated bidirectional current triggering of between 0 and 10mA in a two-terminal planar device based on a highly resistive vanadium dioxide (VO2) thin film grown by a pulsed laser deposition method. A two-terminal planar device, which had an electrode separation of 100μm and a 50μm-wide VO2 conducting layer, was fabricated through ion beam-assisted milling and photolithographic techniques. A bias voltage range for stable bidirectional current triggering was determined by investigating the current-voltage curves of the VO2?based device in a current-controlled mode. Bidirectional current triggering of up to 10mA was realized by directly illuminating the VO2 film with a focused infrared laser beam, and the transient responses of triggered currents were analyzed when the laser was modulated at various pulse widths and repetition rates. A switching contrast between off- and on-state currents was evaluated as ∼3571, and the rising and falling times were measured as ∼40 and ∼20ms, respectively. |