Reduced dielectric screening and enhanced energy transfer in single and few-layer MoS2

Abstract

We report highly efficient non-radiative energy transfer from cadmium selenide (CdSe) quantum dots to monolayer and few-layer molybdenum disulfide (MoS2). The quenching of the donor quantum dot photoluminescence increases as the MoS2 flake thickness decreases, with the highest efficiency (>95%) observed for monolayer MoS2. This counterintuitive result arises from reduced dielectric screening in thin layer semiconductors having unusually large permittivity and a strong in-plane transition dipole moment, as found in MoS2. Excitonic energy transfer between a 0D emitter and a 2D absorber is fundamentally interesting and enables a wide range of applications including broadband optical down-conversion, optical detection, photovoltaic sensitization, and color shifting in light-emitting devices.

14 pages, 4 figures

References in corpus (6)

• Two Dimensional Atomic Crystals
• Anomalous Lattice Vibrations of Single and Few-Layer MoS2
• Large and tunable photo-thermoelectric effect in single-layer MoS2
• Electron-hole transport and photovoltaic effect in gated MoS2 Schottky junctions
• Optical identification of atomically thin dichalcogenide crystals
• Electric field screening in atomically thin layers of MoS2: the role of interlayer coupling

Cited by in corpus (5)

• Electrical control of near-field energy transfer between quantum dots and 2D semiconductors
• Near-field relaxation of a quantum emitter to 2D semiconductors: surface dissipation and exciton polaritons
• Exciton-photon interactions in semiconductor nanocrystals: {radiative transitions, non-radiative processes,} and environment effects
• Non-Markovian spontaneous emission dynamics of a quantum emitter near a MoS${}_2$ nanodisk
• Resonant exciton transfer in mixed-dimensional heterostructures for overcoming dimensional restrictions in optical processes