caa a22 4500 445826924 CHVBK 20180317145302.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10854-011-0320-2 doi (NATIONALLICENCE)springer-10.1007/s10854-011-0320-2 Effects of cobalt doping on the electrical properties of MBE-grown ZnO [Elektronische Daten] [D. Seghier, H. Gislason] We investigated n-conducting Co-doped ZnO epilayers grown by MBE with a cobalt content of nominal 4, 12, and 18 at.% by means of deep level transient spectroscopy (DLTS) and resistivity measurements. We found that in materials grown at the same substrate temperature, 500°C, the resistivity decreases with the cobalt mole fraction. The free electron concentration accounts for most of the change in the resistivity. The DLTS measurements reveal the presence of a defect center located at Ec−0.5eV, which is (1) metastable; (2) sensitive to annealing in oxygen-free ambient, and (3) decreasing in density in the samples with higher cobalt content. We therefore assign the center to the isolated oxygen vacancy. Furthermore, our results support the hypothesis that ferromagnetism in ZnO:Co is mediated by Co-oxygen vacancy pairs. Springer Science+Business Media, LLC, 2011 Seghier D. Science Institute, University of Iceland, Dunhagi 3, IS-107, Reykjavík, Iceland aut Gislason H. Science Institute, University of Iceland, Dunhagi 3, IS-107, Reykjavík, Iceland aut Journal of Materials Science: Materials in Electronics Springer US; http://www.springer-ny.com 22/9(2011-09-01), 1400-1403 0957-4522 22:9<1400 2011 22 10854 https://doi.org/10.1007/s10854-011-0320-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10854-011-0320-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Seghier D. Science Institute, University of Iceland, Dunhagi 3, IS-107, Reykjavík, Iceland aut NATIONALLICENCE 700 1- Gislason H. Science Institute, University of Iceland, Dunhagi 3, IS-107, Reykjavík, Iceland aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Electronics Springer US; http://www.springer-ny.com 22/9(2011-09-01), 1400-1403 0957-4522 22:9<1400 2011 22 10854 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer