A.I. Radu, V.A. Antohe, S. Iftimie, I. Antohe, M. Filipescu, A. Radu, D. Coman, M. L. Stîngescu, E. I. Bancu, M. Dinescu and Ș. Antohe- "New composite based on SnO2 nanoparticles-P3HT:PC71BM co-polymer blend, as absorber in bulk heterojunction photovoltaic cells" - oral presentation