Abstract
Substitutional doping of transition metal dichalcogenides (TMDs) may provide routes to achieving tunable p-n junctions, bandgaps, chemical sensitivity, and magnetism in these materials. In this study, we demonstrate in situ doping of monolayer molybdenum disulfide (MoS 2 ) with manganese (Mn) via vapor phase deposition techniques. Successful incorporation of Mn in MoS 2 leads to modifications of the band structure as evidenced by photoluminescence and X-ray photoelectron spectroscopy, but this is heavily dependent on the choice of substrate. We show that inert substrates (i.e., graphene) permit the incorporation of several percent Mn in MoS 2 , while substrates with reactive surface terminations (i.e., SiO 2 and sapphire) preclude Mn incorporation and merely lead to defective MoS 2 . The results presented here demonstrate that tailoring the substrate surface could be the most significant factor in substitutional doping of TMDs with non-TMD elements.
Original language | English |
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Pages (from-to) | 6586-6591 |
Number of pages | 6 |
Journal | Nano Letters |
Volume | 15 |
Issue number | 10 |
DOIs | |
State | Published - 14 Oct 2015 |
Externally published | Yes |
Keywords
- Transition metal dichalcogenide
- in situ doping
- manganese
- molybdenum disulfide
- two-dimensional heterostructure