Fig. 4: Constructing single-molecule devices based on MCBJ chip.

a Schematic of the MCBJ chip. The SEM image of the nanogap electrodes is shown with a 1 μm scale bar. Molecular component 1 is expected to have a random orientation between the nanogap electrode. b 2D I-V histogram constructed from 1445 (out of 2302) traces exhibiting current jumps. The representative I-V curve is shown in the yellow line, which is replotted in the inset figure (current vs. bias) with the current value on a linear scale. The color scale represents intensity. c Based on the representative I-V curve, the TVS is shown correspondingly for both the negative and positive bias. The absolute values of transition voltage are shown correspondingly. The unit of the x-axis is V⁻¹. d The conductance trace of a single-molecule device shows the switching behavior with the change of bias. The conductance and bias values are shown in blue and brownish-red colors. e The data within the dashed frames of (d) is zoomed to show the switching with bias changed between 0.1 and 0.6 V.