Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 32: Poster: ZnO and its relatives

HL 32.5: Poster

Montag, 31. März 2014, 17:00–20:00, P2

IR absorption study of cobalt doped ZnO — •Preeti Pandey^{1, 2}, Edward V. Lavrov¹, and Jörg Weber¹ — ¹Technische Universität, 01062 Dresden, Germany — ²Indian Institute of Technology Roorkee, Roorkee, India

Ferromagnetic Diluted Magnetic Semiconductors (DMSs) are expected to be a potential candidate for spin dependent electronics known as spintronics. Prediction of room temperature ferromagnetism in transition metal doped ZnO has initiated extensive research in this area [1]. Although much of research has been done regarding the electrical and magnetic properties of the material, it is equally important to analyze the optical properties. Vapor phase grown ZnO crystals doped with cobalt have been investigated by means of FTIR spectroscopy. Along with the temperature dependent spectra, polarized spectra of Co²⁺(d⁷) ions occupying substitutional Zn sites have been studied. Absorption lines due to ⁴A₂(F) → ⁴T₂(F) transitions positioned at 3609.4, 3614.9, 3628.5 and 3634.1 cm⁻¹ are observed. Effect of hydrogen treatment on the cobalt-related complexes has also been probed. [1]. T. Dietl et al., Science, Vol. 287, 1019, 2000