【Person in charge of results】

   Zhao Weiwei

Highlights:

    First, the Kelvin probe microscope was used for the first time to give the change rule of MoS2 nanosheet work function with the number of layers, and it was found that it has a weaker interlayer shielding effect, which was successfully explained by the charge transfer model;

    Second, the use of self-assembled monolayers to control the work function of MoS2 nanosheets, with a control range of 0.45–0.47 eV, and confirms the significant charge transfer mechanism at the interface between the monolayer and MoS2;

    Third, it is confirmed that the single-layer MoS2/Si vertical heterostructure has good photodiode performance, and it has a high light response value (up to 7.2A/W) in the ultraviolet and near-infrared bands.

Figure 1 Measuring the electrical properties of MoS2 devices combined with KFM         Figure 2 Using self-assembled monolayers to control the work function of MoS2