Achieving tunability of two dimensional (2D) transition metal dichalcogenides
(TMDs) functions calls for the introduction of hybrid 2D materials by means of
localized interactions with zero dimensional (0D) materials. A
metal-semiconductor interface, as in gold (Au) - molybdenum disulfide (MoS2),
is of great interest from the standpoint of fundamental science as it
constitutes an outstanding platform to investigate plasmonic-exciton
interactions and charge transfer. The applied aspects of such systems introduce
new options for electronics, photovoltaics, detectors, gas sensing, catalysis,
and biosensing. Here we consider pristine MoS2 and study its interaction with
Au nanoislands, resulting in local variations of photoluminescence (PL)
associated with various Au-MoS2 hybrid configurations. By controllably
depositing monolayers of Au on MoS2 to form Au nanostructures of given size and
thickness, we investigate the electronic structure of the resulting hybrid
systems. We present strong evidence of PL quenching of MoS2 as a result of
charge transfer from MoS2 to Au: p-doping of MoS2. The results suggest new
avenues for 2D nanoelectronics, active control of transport or catalytic
properties
