THEORETICAL AND EXPERIMENTAL INVESTIGATIONS OF SOME FACTORS INFLUENCING THE ENERGY LEVELS OF BILAYER AND MULTILAYER MOS2

Abstract

As a member of transition metal dichalcogenides (TMDC) family, molybdenum disulfide (MoS2) has an intrinsic bandgap. In this work, a self-consistent method is applied to study how the interlayer screening interactions between bilayer MoS2 can influence the energy bandgaps. The self-consistency yield the screening potential and conduction band gap that are strongly suppressed, which agrees with experiments concerning spin-splitting energy. For multi-layer MoS2, laser modifications are implemented on parts of the samples experimentally, as the analysis of the photoluminescence (PL) and Raman spectra reveal that chemical oxidation process would occur after laser modification. Laser power, chemical oxidation and temperature can impact on the energy levels of the MoS2 micro-flakes.