Coulomb engineering of the bandgap and excitons in two-dimensional materials
By A. Raja, A. Chaves, Jaeeun Yu, Ghidewon Arefe, H. Hill, A. Rigosi, Timothy C. Berkelbach, P. Nagler, C. Schüller, T. Korn and 6 more. Nature Communications, 2017
721 citations recorded by the source corpus.
The ability to control the size of the electronic bandgap is an integral part of solid-state technology. Atomically thin two-dimensional crystals offer a new approach for tuning the energies of the electronic states based on the unusual strength of the Coulomb interaction in these materials and its environmental sensitivity. Here, we show that by engineering the surrounding dielectric environment, one can tune the electronic bandgap and the exciton binding energy in monolayers of WS2 and WSe2 by hundreds of meV. We exploit this behaviour to present an in-plane dielectric heterostructure with a spatially dependent bandgap, as an initial step towards the creation of diverse lateral junctions with nanoscale resolution. Electronic bandgap tuning in semiconductors enables key functionalities in solid-state devices. Here, the authors present a strategy to control the bandgap of atomically thin WS2 and WSe2semiconductors via manipulation of the surrounding dielectric environment rather than by modifications of the materials themselves.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/e53f478e8315ebed7d03e878a1405ac2430bb028
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In Materials Chemistry
Citations in the corpus
- Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors (2018, methodology): “generation [49] or internal excitonic 1s-2p transitions [46]. Recent studies show that one can tune the exciton binding energy by hundreds of meV by engineering the surrounding dielectric environment [52, 53]. One can even design inplane dielectric heterostructure with a spatially dependent binding ”
- Momentum-space indirect interlayer excitons in transition-metal dichalcogenide van der Waals heterostructures (2018, background): “The ML regions display the well-known A exciton and trion peaks [11, 12, 13, 14] near 1.”