Christoph Knies
University of Giessen
6 Papers
74 Citations
Christoph Knies is an academic researcher from University of Giessen. The author has contributed to research in topics: Thin film & Wurtzite crystal structure. The author has an hindex of 4, co-authored 6 publications.
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Papers
Raman studies of ZnO:Co thin films
Huijuan Zhou,Limei Chen,Vivek Kumar Malik,Vivek Kumar Malik,Christoph Knies,Detlev M. Hofmann,Kanwal Preet Bhatti,Sujeet Chaudhary,Peter J. Klar,Wolfram Heimbrodt,Claus F. Klingshirn,Heinz Kalt +11 more
TL;DR: In this article, the authors investigate cobalt doped ZnO thin films prepared via different sol-gel methods and demonstrate that XRD is not a suitable method to rule out the existence of magnetic secondary phases in ZnOs doped with transition metals.
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Synthesis and characterization of ZnO:Co2+ nanoparticles
N. Volbers,Huijuan Zhou,Christoph Knies,D. Pfisterer,Joachim Sann,Detlev M. Hofmann,Bruno K. Meyer +6 more
TL;DR: In this paper, the authors investigated cobalt doped ZnO nanoparticles prepared by using wet chemical methods and characterized the electronic structure as well as the optical and magnetic properties of Co2+ nanoparticles.
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Optical and magnetic properties of c ‐oriented ZnCoO films
Huijuan Zhou,Huijuan Zhou,Christoph Knies,Detlev M. Hofmann,Jan Eric Stehr,N. Volbers,Bruno K. Meyer,Limei Chen,Peter J. Klar,Wolfram Heimbrodt +9 more
TL;DR: In this article, the fine structures of the Co (3d 7 ) internal absorptions are well resolved, all zero-phonon lines (ZPL) and phonon replica related to the 4 T 1 (F) → 4 A 2 are observed, demonstrating the good crystalline quality of the layers and the incorporation of Co 2+ on Zn 2+ lattice sites.
11
Nonferromagnetic nanocrystalline ZnO:Co thin films doped with Zn interstitials
Christoph Knies,Matthias T. Elm,Peter J. Klar,Jan Eric Stehr,Detlev M. Hofmann,N. M. Romanov,T. Kammermeier,Andreas Ney +7 more
TL;DR: In this paper, the crystal field transitions of Co2+ in the near infrared and visible spectral range were investigated and the results of magnetotransport measurements were explained by the formation of an impurity band situated below the conduction band.
9
Trivalent molybdenum in ZnO
Jan Eric Stehr,Christoph Knies,A. Hofstaetter,Detlev M. Hofmann,Wei Xu,Yingxue Zhou,Xinyi Zhang +6 more
TL;DR: In this paper, the effective spin-Hamiltonian (S 1 / 2 ) parameters of this 4d 3 configuration were determined, i.e. g ∥ 1.963 and g ⊥ 3.933.
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