caa a22 4500 463211065 CHVBK 20180405153141.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s00339-007-3992-y doi (NATIONALLICENCE)springer-10.1007/s00339-007-3992-y Electrical and optical spectroscopy on ZnO:Co thin films [Elektronische Daten] [H. Schmidt, M. Diaconu, H. Hochmuth, G. Benndorf, H. von Wenckstern, G. Biehne, M. Lorenz, M. Grundmann] Magnetic oxide semiconductors, for example the highly transparent and intrinsically n-type conducting zinc oxide doped with the 3d transition metal Co (ZnO:Co), are promising for the emerging field of spintronics [1]. We investigated n-conducting ZnO:Co thin films with a Co content of nominal 0.02, 0.20, or 2.00at. %. The substitution of Co cations in the tetrahedral sites of wurtzite ZnO with Zn was confirmed at low temperature by the 1.877eV photoluminescence between crystal field split d-levels of Co2+ (d7) ions. Based on theoretical studies, it is predicted that the formation of electron levels with zinc interstitials (IZn) or hole levels with zinc vacancies (VZn) is necessary to induce ferromagnetism, whereas the formation of electron levels with oxygen vacancies (VO) is detrimental for ferromagnetism in ZnO:Co [2]. Cobalt generates a hole level in ZnO [3]. We investigated the generation of electron levels in n-conducting ZnO:Co in dependence on the Co content by means of deep level transient spectroscopy (DLTS). However, because of the ambiguous categorization of deep defects in n-conducting ZnO (VO, IZn), an optimization of defect-related ferromagnetism in ZnO:Co is not possible at the moment. Springer-Verlag, 2007 Schmidt H. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Diaconu M. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Hochmuth H. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Benndorf G. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut von Wenckstern H. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Biehne G. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Lorenz M. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Grundmann M. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Applied Physics A Springer-Verlag 88/1(2007-07-01), 157-160 0947-8396 88:1<157 2007 88 339 https://doi.org/10.1007/s00339-007-3992-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3992-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schmidt H. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Diaconu M. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Hochmuth H. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Benndorf G. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- von Wenckstern H. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Biehne G. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Lorenz M. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Grundmann M. Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/1(2007-07-01), 157-160 0947-8396 88:1<157 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer