Regensburg 2004 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HL: Halbleiterphysik

HL 40: SiC I

HL 40.3: Vortrag

Donnerstag, 11. März 2004, 15:45–16:00, H15

Deep Levels of Gadolinium in Silicon Carbide — •Gunnar Pasold1, Fanny Albrecht1, Christian Hülsen1, Rainer Sielemann2, Wolf Dietrich Zeitz2, and Wolfgang Witthuhn11Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Max-Wien-Platz 1, 07743 Jena — 2Hahn- Meitner- Institut Berlin, Glienicker Straße 100, D-14109 Berlin

Epitaxial layers of hexagonal silicon carbide (SiC) were doped with the radioactive isotope 149Gd by recoil-implantation at the HMI (Berlin). Deep Level Transient Spectra (DLTS) were taken, repeatedly, during the elemental transmutation 149Gd → 149Eu (T0.5ex 1−0.1em/−0.15em 0.25ex 2=9.5 d)

Spectra taken on p-type SiC reveal two deep levels (ET=EV+0.94±2 eV and ET=EV+0.45±1 eV), undergoing a decrease in concentration with a half-life of 11±1 d identifying them as Gd correlated. Whereas the deeper one has been found in 4H and 6H-SiC, the lower one is observable in the 4H polytype only.

Deep levels with increasing concentrations indicating levels caused by the daughter element Eu were not observed in the part of the band-gap of SiC investigated. N-type SiC samples implanted with 149Gd show no time dependent deep level concentrations.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2004 > Regensburg