Small molecular thienoquinoidal dyes as electron donors for solution processable organic photovoltaic cells

Two small molecular quinoidal thiophene dyes, featuring quinoidal thiophene as a spacer, N,N-diethylaniline or N,N-bis(p-methylphenyl)aniline as an electron donor moiety, and dicyanomethylene as an electron acceptor moiety, have been synthesized as donors for organic photovoltaic cells, and a best power conversion efficiency of 5.12% has been achieved.