Schwingungs- und elektronenspektroskopische Untersuchungen an reinen und wasserstoffbedeckten III-Nitridoberflächen

Dateibereich 5463

3,23 MB in 2 Dateien, zuletzt geändert am 24.10.2006

Dateiliste / Details

DateiDateien geändert amGröße
DissGrabowski.pdf04.06.2002 00:00:003,21 MB
index.html24.10.2006 11:30:3718,9 KB
In this thesis clean GaN{0001} as well as AlGaN(0001) surfaces were characterized by high-resolution electron energy-loss spectroscopy (HREELS) and electron spectroscopic means. Moreover, the interaction of hydrogen with GaN{0001} surfaces of both polarities was investigated. At clean GaN surfaces the vibrational and electronic properties were determined, surface cleaning procedures and thermal decomposition were examined. By means of HREELS the energy of the Fuchs-Kliewer (FK)-phonon was determined as 86.8 meV. At Ga-polar surfaces a gap state at 2.7 eV was found. Atomic hydrogen was found to bind to both N and Ga. Deuteration of the surface delivered clear evidence for this behaviour and, thus, resolved a discrepancy published in the literature. Photoemission measurements confirmed this finding. The properties of AlGaN surfaces were investigated as a function of their composition. Over the whole composition range no evidence for a negative electron affinity was found. The FK phonons of AlGaN show a one-mode behaviour.
PURL / DOI:
Lesezeichen:
Permalink | Teilen/Speichern
Dokumententyp:
Wissenschaftliche Abschlussarbeiten » Dissertation
Fakultät / Institut:
Fakultät für Physik
Dewey Dezimal-Klassifikation:
500 Naturwissenschaften und Mathematik » 530 Physik
Stichwörter:
phonons, gallium nitride (GaN), Electron energy loss spectroscopy (EELS), AlGaN, Auger electron spectroscopy, vibrations of adsorbed molecules
Beitragende:
Prof. Dr. Mönch, Winfried [Betreuer(in), Doktorvater]
Prof. Dr. Courths, Ralf [Gutachter(in), Rezensent(in)]
Sprache:
Deutsch
Kollektion / Status:
Dissertationen / Dokument veröffentlicht
Datum der Promotion:
04.06.2002
Dokument erstellt am:
04.06.2002
Dateien geändert am:
24.10.2006
Medientyp:
Text