Chinese Science Bulletin, Volume 66 , Issue 10 : 1115-1130(2021) https://doi.org/10.1360/TB-2020-1320

High temporal resolution electrical characterization technology of single-molecule devices

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  • ReceivedOct 15, 2020
  • AcceptedJan 14, 2021
  • PublishedJan 22, 2021


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  • Figure 1

    The hardware structure (MCBJ) and experimental data analysis results (STM-BJ) of single-molecule break junction technology.(a) The architecture diagram of MCBJ; (b) the conductance traces and statistical histograms of conductance.(b1, b2) Metal atom point contacts and molecular junctions formed, leaving steps on the conductance track; (b5) direct solvent tunneling, no steps on the conductance trace.The three insert pictures with color are the schematic diagrams of electrode connection states in the above three cases.The histograms shown in diagram (b2), (b4) and (b6) are obtained by superimposing conductance traces in diagram (b1), (b3) and (b5) respectively, the peaks caused by metal atom point contacts and molecular junction could be seen clearly[27]

  • Figure 2

    The structure and response speed of logarithmic amplifier[33]. (a) Circuit diagram of the logarithmic amplifier; (b) the frequency response of the amplifier at different input currents

  • Figure 3

    The molecular test carried out by our research group.(a) The structural of the OAE2 molecule used in the experiment; (b) the output data of logarithmic amplifier, the diagram shows the two-dimensional conductance-distance statistical histogram of opening and closing processes after data processing, and the vertical coordinate shows the conductance of about 10 orders of magnitude[40]

  • Figure 4

    The amplifier system based on the Wheatstone bridge designed[36]

  • Figure 5

    The DC signal and AC response obtained from the break junction experiment[51].The red curve represents the DC signal and the blue curve represents the AC response.The experimental systems are as follows: (a) Pure mesitylene, no molecular junction formed; (b)−(d) mesitylene containing 0.2 mmol/L 1,8-octanedithiol, the molecular junction formed

  • Figure 6

    The observed “snap-back” phenomenon assisted by AC signal[52]. The red curve shows the relationship between the conductance and the stretching distance of STM tip, and the blue curve indicates the fluctuation of AC signal

  • Figure 7

    Circuit diagram and experimental results of the experimental setup used to detect the transient process in atomic point contact.(a) Diagram of the experimental setup; (b–d) the experimental results, the black curve represents the DC conductance, and the blue curve represents the response of the AC signal synchronized with the DC signal.The change of DC conductance is accompanied by the fluctuation of AC signal for the duration within 10 ns, and there are double peaks with very short interval in each wavelet[50]

  • Figure 8

    The kinetic study of single-molecule electronic devices based on graphene-BPP34C10[54].(a) Schematic diagram of the single-molecule device; (b) the I-t data of the single molecule device obtained by real-time electrical measurement; (c) partial I-t data (160 to 180 s); (d) the histogram of I-t data

  • Figure 9

    Our group’s research on flicker noise. (a) The diagram of cySMe and cySAc; (b) condutance histogram of cySMe and cySAc; (c), (d) the 2D histogram of flicker noise power versus average conductance of cySMe and cySAc

  • Figure 10

    Experimental devices used to detect shot noise (a), (b) and the corresponding measurement results (c), (d)[70,73]

  • Figure 11

    Example of combining shot noise measurement with actual scientific research[79].(a) The zigzag and linear structure of atomic chain during the stretching process; (b) the transmission probability of each quantum transmission channel calculated from the measured shot noise