Experimental investigation of dimension effect on electrical oscillation in planar device based on VO_2 thin film

摘要

In this paper, we report on an experimental analysis of dimension effect on a room-temperature electrical oscillation in a planar device using vanadium dioxide (VO_2) thin film. We investigate the variation of the oscillation current (/o) and frequency (f0) due to the variation of the dimension of the VO_2 devices, i.e., the length and width of the current channel of the device. For five different VO_2 devices with different dimensions, I_O andf_o are observed at room temperature in a simple circuit composed of a dc voltage source and a standard resistor including one of the VO2 devices. From the experimental investigation, it is concluded that the peak-to-peak amplitude of _I0 and f_0 decrease with the increase of the length and width of the current channel. This indicates thatf_0 depends on not only the external source voltage but also the device dimension.