1. Material Research Department, IHP—Leibniz Institut fur innovative Mikroelektronik, Frankfurt (Oder), Germany
2. Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano and IU.NET, Milano, Italy
3. Material Research Department, IHPŮLeibniz Institut fur innovative Mikroelektronik, Frankfurt (Oder), Germany
4. Material Research Department, IHP-Leibniz Institut fur innovative Mikroelektronik, Frankfurt (Oder), Germany
5. Dipartimento di Ingegneria, Universita degli Studi di Ferrara, Ferrara, Italy