Journal
ACS NANO
Volume 10, Issue 8, Pages 7840-7846Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b03518
Keywords
tungsten disulfide monolayer; epitaxial graphene; heterostructures; excitonic effects; work function; trions; ab initio calculations
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Funding
- UK's National Measurements Service under SC Graphene Project [CNECT-ICT-604391]
- UK's National Measurements Service under Graphene Flagship [CNECT-ICT-604391]
- U.S. Army Research Office MURI [W911NF-11-1-0362]
- Penn State Center for Nanoscale Science [DMR-0820404, DMR-1420620]
- National Science Foundation [2DARE-EFRI-1433311, 2DARE-EFRI-1542707]
- Center for Low Energy Systems Technology (LEAST), one of six centers - STARnet phase of the Focus Center Research Program (FCRP), a Semiconductor Research Corporation program
- MARCO
- DARPA
- Engineering and Physical Sciences Research Council [1363755] Funding Source: researchfish
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1433311] Funding Source: National Science Foundation
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Light emission in atomically thin heterostructures is known to depend on the type of materials and the number and stacking sequence of the constituent layers. Here we show that the thickness of a two-dimensional substrate can be crucial in modulating the light emission. We study the layer-dependent charge transfer in vertical heterostructures built from monolayer tungsten disulfide (WS2) on one- and two-layer epitaxial graphene, unravelling the effect that the interlayer electronic coupling has on the excitonic properties of such heterostructures. We bring evidence that the excitonic properties of WS, can be effectively tuned by the number of supporting graphene layers. Integrating WS, monolayers with two-layer graphene leads to a significant enhancement of the photoluminescence response, up to 1 order of magnitude higher compared to WS, supported on one-layer graphene. Our findings highlight the importance of substrate engineering when constructing atomically thin-layered heterostructures.
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