Affiliation: | 1. Tampere University of Technology, Department of Materials Science, P.O. Box 589, FI-33101, Tampere, Finland;2. VTT, Technical Research Centre of Finland, P.O. Box 1000, FI-02044, VTT, Finland;3. VTT, Technical Research Centre of Finland, P.O. Box 1300, FI-33101, Tampere, Finland;4. Tampere University of Technology, Optoelectronics Research Centre, P.O. Box 692, FI-33101, Tampere, Finland |