Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 17: Poster Ib

HL 17.12: Poster

Friday, March 4, 2005, 16:30–19:00, Poster TU F

Transport properties of n-doped Zn_1−xMn_xSe semimagnetic heterostructures — •B. Daniel, K. C. Agarwal, J. Lupaca-Schomber, J. Kvietkova, C. Klingshirn, and M. Hetterich — Institut für Angewandte Physik and Center for Functional Nanostructures (CFN), Universität Karlsruhe, D-76131 Karlsruhe, Germany

Zn_1−xMn_xSe alloys are promising candidates as spin aligners in optoelectronic spin devices. A series of n-doped Zn_1−xMn_xSe:Cl samples with various compositions and doping concentrations has been grown by molecular beam epitaxy using elemental sources and ZnCl₂. To determine the carrier concentration and mobility as a function of temperature, Hall measurements in the van der Pauw geometry have been carried out on lithographically prepared clover leaf samples. Doping concentrations in the 10¹⁸cm⁻³ range were observed in Zn_1−xMn_xSe. With increasing Mn concentration a decrease in both the dopability and mobility was observed. Recently, we have also started further experiments concerning the investigation of Zn_1−xMn_xSe/gold Schottky diodes and the magnetic field dependent tunnelling in Zn_1−xMn_xSe/ZnSe structures.