Substrate proximity doping induced optical properties and ultrafast carrier dynamics modulation in monolayer MoS2

Here we confirm the proximity doping effect of the substrate on 2D materials through photoluminescence (PL), absorption, Raman and XPS spectra.

Due to the proximity doping effect of the conductive substrate, the absorption and PL properties of MoS2 will be affected, which makes their optical behavior dominated by negatively charged excitons rather than excitons. Furthermore, through micro-area nonlinear optical and transient absorption tests, it was proved that this effect can also affect the recombination process of non-optically active excitons and ultrafast carriers formed by band nesting.