Molybdenum disulfide (MoS2) is a two-dimensional (2D) material, which exhibits fascinating electronic and optoelectronic properties^{1 2}. MoS2 is usually grown by Chemical Vapour Deposition (CVD) on Si/SiO2, however several envisioned applications and fundamental investigations require either freestanding films suspended on metal grids or MoS2 on conducting substrates, and hence a good transfer method is crucial. Some conventional methods to transfer MoS2 from Si/SiO onto another substrate require long C-chain polymer, which need to be etched away by hazardous chemicals such as HF. These methods leave polymer residues on the MoS2 layer or decrease electron mobility due to defects created in the aggressive etching process.

In this BSc project, the student will investigate a new MoS2 transfer method employing using a water-soluble polymer, which can easily remove by dissolving in water hence is expected to preserve the good quality of MoS2 after transfer. The student will optimize the transfer protocol, learn various characterisation techniques (Scanning electron microscopy, Raman spectroscopy, Photoelectron spectroscopy) and compare the properties of MoS2 transferred by the new method and by the standard protocol using HF.

BSc Research Project (Both suitable for Physics and for Applied Physics)
Expected Time : 10 weeks
Daily supervisor: PhD student Ali Syari’ati (Surfaces and Thin Films Research Group)
Supervisor: Prof. Petra Rudolf

References:

<sup>1. [(1) O.V. Yazyev, A. Kis, Mater. Today 18 (2015) 20–30. ]↩
2. [(2) I. Song, C. Parkab, H.C. Choi, RSC Adv. 5 (2015) 7495–7514. ]↩</sup>