Journal article · Preprint article
Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures
University of California at Los Angeles1
Princeton University2
University of Minnesota Twin Cities3
Department of Micro- and Nanotechnology, Technical University of Denmark4
Theoretical Nanotechnology, Department of Micro- and Nanotechnology, Technical University of Denmark5
Center for Nanostructured Graphene, Centers, Technical University of Denmark6
Vertically stacked van der Waals heterostructures constitute a promising platform for providing tailored band alignment with enhanced excitonic systems.Here we report observations of neutral and charged interlayer excitons in trilayer WSe2-MoSe2-WSe2 van der Waals heterostructures and their dynamics.
The addition of a WSe2 layer in the trilayer leads to significantly higher photoluminescence quantum yields and tunable spectral resonance compared to its bilayer heterostructures at cryogenic temperatures. The observed enhancement in the photoluminescence quantum yield is due to significantly larger electron-hole overlap and higher light absorbance in the trilayer heterostructure, supported via first-principle pseudopotential calculations based on spin-polarized density functional theory.
We further uncover the temperature- and power-dependence, as well as time-resolved photoluminescence of the trilayer heterostructure interlayer neutral excitons and trions. Our study elucidates the prospects of manipulating light emission from interlayer excitons and designing atomic heterostructures from first-principles for optoelectronics.
Language: | English |
---|---|
Publisher: | Nature Publishing Group UK |
Year: | 2018 |
Pages: | 25 |
ISSN: | 23977132 |
Types: | Journal article and Preprint article |
DOI: | 10.1038/s41699-018-0075-1 |
ORCIDs: | Kaasbjerg, Kristen , 0000-0003-3091-8413 and 0000-0003-0645-7231 |