1 research outputs found
Colloidal Single-Layer Quantum Dots with Lateral Confinement Effects on 2D Exciton
Controlled lateral
quantum confinement in single-layer transition-metal
chalcogenides (TMCs) can potentially combine the unique properties
of two-dimensional (2D) exciton with the size-tunability of exciton
energy, creating the single-layer quantum dots (SQDs) of 2D TMC materials.
However, exploring such opportunities has been challenging due to
the limited ability to produce well-defined SQDs with sufficiently
high quality and size control, in conjunction with the commonly observed
inconsistency in the optical properties. Here, we report an effective
method to synthesize high-quality and size-controlled SQDs of WSe<sub>2</sub> via multilayer quantum dots (MQDs) precursors, which enables
grasping a clear picture of the role of lateral confinement on the
optical properties of the 2D exciton. From the single-particle optical
spectra and polarization anisotropy of WSe<sub>2</sub> SQDs of varying
sizes in addition to their ensemble data, we reveal how the properties
of 2D exciton in single-layer TMCs evolve with increasing lateral
quantum confinement