In this talk, we will provide an overview on the state of the art of organic solar cells. In particular we will concentrate on solar cells based on small-molecules organic semiconductors. Recently our group has reach 4 % efficiency using DBP and C70 as a donor and acceptor semiconductors in a p-i-n solar cell geometry. Moreover, the use of Thin-Film Transistors as a tool for estimating carrier field-effect mobility and density-of states will be described. Correlation between efficiency of solar cells and density-of-states will be shown and discussed.
Prof. Dr. Joaquim Puigdollers, obtained his PhD degree in 1995 from the University of Barcelona, Spain, on p-i-n amorphous silicon solar cells. After that he worked in a company designing grid-connect PV systems. In 1998 he joined the Polytechnic University of Catalonia as an Associated Professor and in 2011 he was appointed to full professor in "Electronics". His research has always been related to the characterization of semiconductors and their use to manufacture solar cells. Currently his research focuses on organic devices. He has authored more than 70 peer reviewed research papers in journals.