Growing oxide thin films in a low-energy electron microscope

Leiden Repository

Growing oxide thin films in a low-energy electron microscope

Type: Doctoral Thesis
Title: Growing oxide thin films in a low-energy electron microscope
Author: Torren, A.J.H. van der
Journal Title: Casimir PhD Series
Issue Date: 2016-12-05
Keywords: Low-energy electron microscopy
Pusled laser deposition
Abstract: By combining low-energy electron microscopy (LEEM) with pulsed laser deposition (PLD), we have created a unique set-up to study the first stages of growth of complex metal oxides. We demonstrate this by investigating the growth of SrTiO3 (STO) and LaAlO3 (LAO) on STO in real-time. We follow growth by monitoring the intensity and the full-width-half-maximum (FWHM) of the specular diffracted beam at various energies. For layer-by-layer growth, we find the anticipated intensity peaks at the completion of each layer, and an oscillatory FWHM with the maximum at half-layer coverage. In the LAO on STO case, for optimal growth conditions and a LAO thickness above the critical thickness of 4 unit cells the interface between the band insulators shows conductivity. We obtain an electronic fingerprint of the growing material, by measuring the intensity of the specular beam as a function of energy at regular intervals during growth. Extending this fingerprint with the intensity dependence on the momentum parallel to the surface allows us to extract the band dispersion of unoccupied electron states of the sample surface. Significant differences in the unoccupied band structure develop between samples which are conducting and non-conducting.
Promotor: Supervisor: J. Aarts Co-Supervisor: S.J. van der Molen
Faculty: Science
University: Leiden
Uri: urn:isbn:9789085932765

Files in this item

Description Size View
application/pdf Full text 27.87Mb View/Open
application/pdf Title page_Contents 426.5Kb View/Open
application/pdf Chapter 1 Introduction 181.2Kb View/Open
application/pdf Chapter 2 857.0Kb View/Open
application/pdf Chapter 3 1.563Mb View/Open
application/pdf Chapter 4 22.40Mb View/Open Full text at publisher site
application/pdf Chapter 5 1.621Mb View/Open
application/pdf Chapter 6 1.302Mb View/Open
application/pdf Chapter 7 2.136Mb View/Open
application/pdf Summary 146.8Kb View/Open
application/pdf Summary in Dutch 151.1Kb View/Open
application/pdf Curriculum Vita ... lications_Acknowledgements 169.6Kb View/Open
application/pdf Propositions 127.8Kb View/Open

This item appears in the following Collection(s)