Unraveling Intertwined Impacts between Lattice Vacancy and Substrate on Photonic Quasiparticles in Monolayer MoS${}_2$

Abstract

Lattice defects and interfacial absorbates represent two extrinsic but ubiquitous factors that exert profound impacts on the luminescent properties of semiconductors. However, their impacts are normally tangled and remain to be separately elucidated. Here, we clarify the individual roles of each factor by tracking the weight evolution of photonic quasiparticles by modulating the densities of sulfur vacancies in monolayer MoS${}_2$ via ad hoc defect engineering. In particular, we perform atomistic analyses on the densities of sulfur vacancies by employing atomically resolved scanning transmission electron microscopy to quantitatively characterize the generation rates of sulfur vacancies in MoS${}_2$ on two types of substrates with opposite surface hydrophobicity natures. We reveal that the generation rate of sulfur vacancies can even double on the hydrophilic substrates. More importantly, the impact of sulfur vacancies over the weight of trionic emission is closely associated with the substrate hydrophobicity, which is manifested noticeably in the hydrophobic substrates, but insignificant in the hydrophilic ones. The results represent an in-depth understanding on the roles of the extrinsic factors on the luminescent properties in atomically thin semiconductors.

20 pages, 5 figures, 1 SI

References in corpus (5)

• Two-Dimensional Material Nanophotonics
• Strong Photoluminescence Enhancement of MoS2 through Defect Engineering and Oxygen Bonding
• Chemical reactivity imprint lithography on graphene: Controlling the substrate influence on electron transfer reactions
• Electrical suppression of all nonradiative recombination pathways in monolayer semiconductors
• Bandgap and doping effects in MoS2 measured by Scanning Tunneling Microscopy and Spectroscopy

Cited by in corpus (1)

• Noninvasive Photodelamination of van der Waals Semiconductors for High-Performance Electronics