Photovoltaics Based On Small Conjugated Molecules

Conjugated systems 1-5 built by connecting a triphenylamine core with a dicyanovinyle electron-accepting moiety are described. Their spectroscopic and electrochemical properties are discussed as well as the performances of corresponding organic photovoltaic devices. Conversion efficiencies attaining nearly 3% before optimization are obtained with some of these compounds. Differences in efficiencies in devices are rationalized in term of nanostructuration of materials.