Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 12: Poster I

HL 12.76: Poster

Monday, March 8, 2004, 16:30–19:00, Poster A

Composition-dependent structural and optical material parameters of Zn_1−xMn_xSe epilayers grown by molecular-beam epitaxy — •M. Hetterich¹, B. Daniel¹, P. Baumann¹, C. Klingshirn¹, P. Pfundstein², D. Litvinov², D. Gerthsen², K. Eichhorn³, and D. Spemann⁴ — ¹Institut für Angewandte Physik and Center for Functional Nanostructures (CFN), Universität Karlsruhe, D-76131 Karlsruhe — ²Laboratorium für Elektronenmikroskopie and CFN, Universität Karlsruhe — ³Institut für Kristallographie, Universität Karlsruhe — ⁴Fakultät für Physik und Geowissenschaften, Universität Leipzig, D-04103 Leipzig

Zn_1−xMn_xSe has recently been demonstrated to be useful as a spin aligner, an important ingredient for a possible spin-based electronics. We investigate cubic Zn_1−xMn_xSe epilayers grown by MBE on GaAs(001). The film quality is assessed by transmission electron microscopy. To determine the Mn concentration, RBS, PIXE and EDX are used. ZnSe and short-period ZnSe/MnSe superlattices serve as a reference for the careful calibration of the EDX system, because the average composition of such pseudoalloys can easily be determined by measuring the individual layer thicknesses through RHEED oscillations. In the next step we determine the elastic constants of Zn_1−xMn_xSe and measure the concentration-dependent lattice parameter using X-ray diffraction. Finally, low temperature absorption, photoluminescence (PL), reflectance and PL excitation spectroscopy (PLE) are applied to learn more about the influence of Mn on the Zn_1−xMn_xSe band gap as well as the exciton binding energy.