In the end of the last month I was on the internship within the Erasmus programe. The internship was conducted in TUBITAK MAM in Gebze in Turkey.Main topic of this period was organic solar cells : the cell formation technology and addition of matal nanoparticles to the hole transporting layer from PEDOT:PSS. For first we tried 70nm particles solution from ICSC PAS but the results were worse for sample with particles than for reference cell. U to 20% of efficiency enhancement was obtained for gold nanoparticles. But the efficiency increase was caused by the Voc increase rather than photocurrent, which was decreased. Thus we explain this results as a series resistance drop due t the nanoparticles presence