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Layered Two-Dimensional Heterostructures and Their Tunneling Characteristics

  • Book
  • © 2017

Overview

Authors:
  1. Sergio C. de la Barrera

    1. Department of Physics, Carnegie Mellon University, Pittsburgh, USA

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  • Nominated as an outstanding Ph.D. thesis by Carnegie Mellon University
  • Focuses on the timely topic of interlayer transport phenomena in two-dimensional materials
  • Describes a theory, illustrated with examples, for computing tunneling currents between two-dimensional crystals around a thin insulating barrier
  • Provides an introduction to the field whilst demonstrating interesting new results via theoretical and experimental perspectives

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (10 chapters)

  1. Front Matter

    Pages i-xvii
    Download chapter PDF

  2. Introduction

    • Sergio C. de la Barrera
    Pages 1-15

  3. Experimental Methods

    • Sergio C. de la Barrera
    Pages 17-30

  4. Thickness Characterization of Tungsten Diselenide Using Electron Reflectivity Oscillations

    • Sergio C. de la Barrera
    Pages 31-47

  5. Tunneling Transport Between Transition Metal Dichalcogenides

    • Sergio C. de la Barrera
    Pages 49-64

  6. Application of Work Function Extraction Method to Material Characterization

    • Sergio C. de la Barrera
    Pages 65-71

  7. Theoretical Background

    • Sergio C. de la Barrera
    Pages 73-85

  8. Theory of Graphene–Insulator–Graphene Tunnel Junctions

    • Sergio C. de la Barrera
    Pages 87-106

  9. Tunneling Between Bilayers of Graphene

    • Sergio C. de la Barrera
    Pages 107-116

  10. Progress Toward 2D Tunneling Devices

    • Sergio C. de la Barrera
    Pages 117-122

  11. Conclusions

    • Sergio C. de la Barrera
    Pages 123-124

  12. Back Matter

    Pages 125-141
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Keywords

About this book

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.

Authors and Affiliations

  • Department of Physics, Carnegie Mellon University, Pittsburgh, USA

    Sergio C. de la Barrera

About the author

Sergio de la Berrera holds a postdoctoral research position at Carnegie Mellon University, from where he also obtained his PhD.

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