Investigating interface states and oxide traps in the MoS2/oxide/Si system

Abstract This paper reports on the study of inverted metal-oxide semiconductor (MOS) structures formed through mechanical exfoliation of MoS2 flakes onto Al2O3 or SiO2 layers grown on degenerately doped p type silicon substrates. Using Au/Ni metal top contacts, multi-frequency capacitance and conductance characterisation were performed to investigate electrically active defects in the MoS2/oxide structures. This data has been paired with physics-based ac simulations which indicate close to ideal interfacial properties.