Layered Two-Dimensional Heterostructures and Their Tunneling Characteristics

Springer (Verlag)
  • erschienen am 4. September 2018
  • Buch
  • |
  • Softcover
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  • 160 Seiten
978-3-319-88744-9 (ISBN)
This thesis demonstrates that layered heterostructures of two-dimensional crystals graphene, hexagonal boron nitride, and transition metal dichalcogenides provide new and interesting interlayer transport phenomena. Low-energy electron microscopy is employed to study the surface of atomically thin WSe2 prepared by metal-organic chemical vapor deposition on epitaxial graphene substrates, and a method for unambiguously measuring the number of atomic layers is presented. Using very low-energy electrons to probe the surface of similar heterostructures, a relationship between extracted work function differences from the layers and the nature of the electrical contact between them is revealed. An extension of this analysis is applied to surface studies of MoSe2 prepared by molecular beam epitaxy on epitaxial graphene. A large work function difference is measured between the MoSe2 and graphene, and a model is provided which suggests that this observation results from an exceptional defect density in the MoSe2 film. The thesis expounds a theory for computing tunneling currents between two-dimensional crystals separated by a thin insulating barrier; a few situations resulting in resonant tunneling and negative differential resistance are illustrated by computed examples, as well as observed characteristics, for monolayer and bilayer graphene tunneling junctions and transistors.
Softcover reprint of the original 1st ed. 2017
  • Englisch
  • Cham
  • |
  • Schweiz
Springer International Publishing
  • Für Beruf und Forschung
  • 44 farbige Tabellen, 7 s/w Abbildungen, 48 farbige Abbildungen
  • |
  • 44 Tables, color; 48 Illustrations, color; 7 Illustrations, black and white; XVII, 141 p. 55 illus., 48 illus. in color.
  • Höhe: 235 mm
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  • Breite: 155 mm
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  • Dicke: 8 mm
  • 252 gr
978-3-319-88744-9 (9783319887449)
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Sergio de la Berrera holds a postdoctoral research position at Carnegie Mellon University, from where he also obtained his PhD.
Chapter1. Introduction.- Chapter2. Experimental Methods.- Chapter3. Thickness Characterization of Tungsten Diselenide Using Electron Reflectivity Oscilations.- Chapter4. Tunneling Transport Between Transition Metal Dichalcogenides.- Chapter5. Application of Work Function Extraction Method to Material Characterization.- Chapter6. Theoretical Background.- Chapter7. Theory of Graphene-Insulator-Graphene Tunnel Junctions.- Chapter8. Tunneling Between Bilayers of Graphene.- Chapter9. Progress Toward 2D Tunneling Devices.- Chapter10. Conclusions.

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