[1] Infineon Technologies, Corporate Research, CPR 3, Otto-Hahn-Ring 6, D 81730 Munich, Germany
[2] University Dortmund, Lehrst. Bauelemente der Elektrotech., D 44227 Dortmund, Germany
[3] Infineon Technologies, ZUVDEV, Otto-Hahn-Ring 6, D 81730 Munich, Germany
[4] Infineon Technologies, PI M, Otto-Hahn-Ring 6, D 81730 Munich, Germany