Distinguishing Ultrafast Energy Transfer in Atomically Thin MoS2/WS2 Heterostructures
Abstract
Van der Waals semiconducting heterostructures, known as stacks of atomically thin transition‐metal dichalcogenide (TMD) layers, have recently been reported as new quantum materials with fascinating optoelectronic properties and novel functionalities. These discoveries are significantly related to the interfacial carrier dynamics of the excited states. Carrier dynamics have been reported to be predominantly driven by the ultrafast charge transfer (CT) process; however, the energy transfer (ET) process remains elusive. Herein, the ET process in MoS2/WS2 heterostructures via transient absorption microscopy is reported. By analyzing the ultrafast dynamics using various MoS2/WS2 interfaces, an ET rate of ≈240 fs is obtain, which is not trivial to the CT process. This study elucidates the role of the ET process in interfacial carrier dynamics and provides guidance for engineering interfaces for optoelectronic and quantum applications of TMD heterostructures.Keywords
Funding Information
- National Natural Science Foundation of China (91850207, 11904266, 12074297, 62005202)
- Fundamental Research Funds for the Central Universities (2042021kf0202)
This publication has 48 references indexed in Scilit:
- Vertical and in-plane heterostructures from WS2/MoS2 monolayersNature Materials, 2014
- Observation of Rapid Exciton–Exciton Annihilation in Monolayer Molybdenum DisulfideNano Letters, 2014
- Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructuresNature Nanotechnology, 2014
- Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals HeterostructureScience, 2013
- Efficient dipole-dipole coupling of Mott-Wannier and Frenkel excitons in (Ga,In)N quantum well/polyfluorene semiconductor heterostructuresPhysical Review B, 2007
- Evidence for wavelike energy transfer through quantum coherence in photosynthetic systemsNature, 2007
- Fluorescence Resonance Energy Transfer Between Quantum Dot Donors and Dye-Labeled Protein AcceptorsJournal of the American Chemical Society, 2003
- Long-Range Resonance Energy Transfer in Molecular SystemsAnnual Review of Physical Chemistry, 2003
- Probing the interaction between two single molecules: fluorescence resonance energy transfer between a single donor and a single acceptor.Proceedings of the National Academy of Sciences, 1996
- Engineering green fluorescent protein for improved brightness, longer wavelengths and fluorescence resonance energy transferCurrent Biology, 1996