Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 100: ZnO and its relatives

HL 100.8: Vortrag

Freitag, 20. März 2015, 11:30–11:45, EW 203

Influence of Fe impurities on the annealing of OH-Li complexes in ZnO — •Frank Herklotz, Klaus Magnus Johansen, Augustinas Galeckas, and Bengt Gunnar Svensson — University of Oslo, Department of Physics/Centre for Materials Science and Nanotechnology, N-0318 Oslo, Norway

The annealing behavior of the OH-Li_Zn center in ZnO, which leads to a local vibrational mode at 3577 cm⁻¹, has been studied. Infrared absorption measurements confirm the previous findings that the center dissociates already at about 450 ^∘C and an apparent stability up to 1250 ^∘C is due to efficient retrapping of H by Li_Zn. Secondary ion mass spectrometry data strongly indicate that Fe impurities prevent a reformation of OH-Li_Zn after dissociation. The formation of Fe-Li complexes is proposed as a mechanism for this behavior. Absorption lines due to Fe in as-grown and intentionally doped ZnO crystals are studied.