1. School of Chemical
Engineering and Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Korea
2. Laboratory of
Photonics and Interfaces, Institute of Chemical Sciences and Engineering,
School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
3. Center for Physical Sciences and Technology, Savanorių Ave. 231, LT-02300 Vilnius, Lithuania
4. Max-Planck-Institute for Solid-State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany