University of Illinois Urbana-Champaign

Photoemission Studies of the Electronic Structure and Properties of Thin Lead Films; nanoscale; atomically; pb films; particle in a box; ARPES; vacume-film; photoelectron;

Upton, Mary Hope

This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.

Permalink

https://hdl.handle.net/2142/35269

Description

Title
Photoemission Studies of the Electronic Structure and Properties of Thin Lead Films; nanoscale; atomically; pb films; particle in a box; ARPES; vacume-film; photoelectron;
Author(s)
Upton, Mary Hope
Issue Date
2005
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • photoemission
  • electronic structure
  • thin lead
  • thin lead films
  • UHV
  • photos
  • beam epitaxy
  • epitaxy
  • schottky barrier
  • schottky
  • crystallographic
  • angle calibration
  • quantum well
  • angular resolution
  • energy resolution
  • subsequent confirmation
  • thermal stability
Language
en
Abstract
This dissertation examines the properties of nanoscale, atomically uniform Pb films grown on Si. We describe a method for growing atomically uniform thin Pb films on Si and various properties of the films. This is the second system of atomically uniform films grown, and the first metal on semiconductor system. (The first system was a metal-on-metal system.) The electrons in the Pb are in a particle-in-a-box-like potential. In two dimensions, transverse to the film, they are in an effectively in¯nite crystal. Normal to the film, the electrons in the films are confined in the film by the vacuum-film potential barrier on one side and by the film-substrate barrier on the other. The states from this confinement are observable and called quantum well states. We studied the properties of these states to learn the electronic structure of the film. The Pb films are studied with angle-resolved photoelectron spectroscopy (ARPES). In ARPES, a sample is illuminated with photons, and electrons excited by the photons are emitted from the sample. By measuring the momentum of the escaping electrons, the electronic structure of the sample can be determined. The quantum well states experience different types of confinement depending on whether they are above or below the Si valence band edge. They show large oscillations in the thermal stability. Adding 1 ML to a film can make it stable to an additional 50±C. The effective masses of the subbands also show some unusual features.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/35269
Copyright and License Information
2005 Upton ©

Owning Collections

Dissertations and Theses - Physics PRIMARY
Dissertations in Physics