Surface Potential Mapping of MoS₂ Monolayers on Au Nanostripe Arrays

Understanding the physical properties of metal-semiconductor contacts is crucial for both electrical characterizations and device applications. In this work, MoS₂ monolayers were transferred on Au nanostripe arrays. The surface potential distributions of the samples in dark and under light illumination were investigated using Kelvin probe force microscopy, which has a few tens of nm spatial resolution. To explain the surface potential contrast change in dark and light, we proposed the energy band diagrams considering the strain and electronic interaction. Optical micro-reflectivity spectra was also obtained and compared with numerical simulation results. The relationship between the surface potential maps and the optical characteristics of the samples will be discussed in this presentation.