1. Physikalische Chemie, Technische Universität Dresden, Bergstraße 66b, 01062 Dresden, Germany
2. L. V. Pysarzhevsky Institute of Physical Chemistry, National Academy of Sciences of Ukraine, Kyiv, Prosp. Nauky 31, Kyiv 03028, Ukraine
3. Semiconductor Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany
4. V. E. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, Kyiv 03028, Ukraine