1. Photovoltaics
and Thin-Film Electronics Laboratory, Institute of Microengineering
(IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Maladière
71, Neuchâtel 2000, Switzerland
2. Institute
of Physics, Academy of Sciences of the Czech Republic, v. v. i., Cukrovarnická
10, 162 00 Prague, Czech Republic
3. PV Center, Centre Suisse d’Electronique et de Microtechnique (CSEM), Jacquet Droz
1, Neuchâtel 2000, Switzerland