III–V Nanowire Surfaces

Research output: ThesisDoctoral Thesis (compilation)

217 Downloads (Pure)

Abstract

This dissertation deals with the geometric and electronic structure of surfaces on III–V semiconductor nanowires
(NWs). NWs made of InAs, GaAs, and InP have been studied using scanning tunneling microscopy/spectroscopy
(STM/S), low energy electron microscopy (LEEM), photoemission electron microscopy (PEEM), and x-ray
photoelectron spectroscopy (XPS).
All of the mentioned techniques have been developed to study 2-dimensional samples and issues related with the
adaption to 3-dimensional nanostructures are discussed, together with solutions on how to overcome them.
Preparation techniques of NW samples for surface science studies, including an effective and seemingly non-destructive
deoxidation routine using atomic hydrogen have been developed.
Using STM/S, it has become possible to study the atomic arrangement at NW surfaces and evaluate the electronic
structure with very high spatial precision. NWs have been studied showing metallic surfaces due to step induced states,
Fermi level pinned surfaces, and unpinned surfaces allowing for general probing of NW properties. With the STM, it
was possible to image from micrometers along individual NWs down to the atomic scale evaluating, among other
things, tapering, surface morphology, and surface reconstructions.
Using LEEM/PEEM as a novel tool for NW studies, it has become possible to determine electronic and geometrical
properties of NWs using low energy electrons or photoelectrons. NW dopant incorporation, work function, and
surface atomic arrangement were studied. In addition, XPS was used to study NW surface chemistry and interfacial
chemistry for NWs covered in high-κ oxides
Original languageEnglish
QualificationDoctor
Awarding Institution
  • Synchrotron Radiation Research
Supervisors/Advisors
  • Mikkelsen, Anders, Supervisor
Award date2014 Feb 7
Publisher
ISBN (Print)978-91-7473-813-1
Publication statusPublished - 2014

Bibliographical note

Defence details

Date: 2014-02-07
Time: 10:15
Place: Rydberg Hall, Fysicum

External reviewer(s)

Name: Tromp, Rudolph
Title: IBM Fellow / Professor
Affiliation: IBM T.J. Watson Research Center, USA & Universiteit Leiden, Netherlands

---

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Keywords

  • low energy electron microscopy
  • scanning tunneling spectroscopy
  • scanning tunneling microscopy
  • surface
  • III–V semiconductor materials
  • nanowire
  • photoemission electron microscopy
  • photoelectron spectroscopy
  • Fysicumarkivet A:2014:Hjort

Fingerprint

Dive into the research topics of 'III–V Nanowire Surfaces'. Together they form a unique fingerprint.

Cite this