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Layered Two-Dimensional Heterostructures and Their Tunneling Characteristics

  • Sergio C. de la Barrera

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xvii
  2. Sergio C. de la Barrera
    Pages 1-15
  3. Sergio C. de la Barrera
    Pages 17-30
  4. Sergio C. de la Barrera
    Pages 73-85
  5. Sergio C. de la Barrera
    Pages 87-106
  6. Sergio C. de la Barrera
    Pages 107-116
  7. Sergio C. de la Barrera
    Pages 117-122
  8. Sergio C. de la Barrera
    Pages 123-124
  9. Back Matter
    Pages 125-141

About this book

Introduction

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.

Keywords

resonant tunneling physics low-energy electron microscopy characterization of tungsten diselenide transition metal dichalcogenides epitaxial graphene work function extraction method interlayer tunneling Bardeen method 2D tunneling devices Graphene-Insulator-Graphene Tunnel Junctions

Authors and affiliations

  • Sergio C. de la Barrera
    • 1
  1. 1.Department of PhysicsCarnegie Mellon UniversityPittsburghUSA

Bibliographic information

  • DOI https://doi.org/10.1007/978-3-319-69257-9
  • Copyright Information Springer International Publishing AG 2017
  • Publisher Name Springer, Cham
  • eBook Packages Physics and Astronomy
  • Print ISBN 978-3-319-69256-2
  • Online ISBN 978-3-319-69257-9
  • Series Print ISSN 2190-5053
  • Series Online ISSN 2190-5061
  • Buy this book on publisher's site
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