DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2006 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

HL: Halbleiterphysik

HL 26: II-VI semiconductors II

HL 26.8: Talk

Tuesday, March 28, 2006, 17:00–17:15, POT 51

Hyperfine splitting in hydrogenated ZnO measured by electron spin resonance — •Marc A. Gluba, Felice Friedrich, and Norbert H. Nickel — Hahn-Meitner-Institut Berlin, Abteilung Silizium-Photovoltaik, Kekuléstraße 5, D-12489 Berlin

The source of the natural n-type doping of zinc oxide single crystals is still not completely clarified. However, hydrogen as an indispensable permanent impurity plays a crucial role. To elucidate the importance of hydrogen X-band electron spin resonance (ESR) measurements were performed on zinc oxide single crystals before and after hydrogenation. Hydrogen was introduced by annealing the samples for two hours at 830C in sealed ampoules under hydrogen atmosphere. The ESR-measurements were performed at 5K.

As-grown zinc oxide exhibits a single ESR line arising from two shallow donors with similar g-values (g||=1,957, g=1,956). One of which was identified as hydrogen [1]. On the other hand, hydrogenated zinc oxide shows distinctly different ESR spectra. Besides the intensification of the donor related line a variety of new features in a broad range of about 1000G around the center line is observed. These are likely to arise from hyperfine interaction between electrons of neutralized hydrogen donors and adjacent 67Zn nuclei of spin 5/2. Based on the performed experiments conclusions on the position of the hydrogen centers in the ZnO lattice can be drawn.

[1] Detlev M. Hofmann et al., Phys. Rev. Lett., 88 no. 4, 045504 (2002)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2006 > Dresden