NEW FUNCTIONALIZED OLIGOTHIOPHENES - PROPERTIES AND APPLICATIONS TO PHOTODETECTION

A series of oligothiophenes nT(up to 6T) substitued at the ends of the chain by electronic donors(D) or acceptors(A) has been prepared. The electrochemical study of the soluble species allowed us to quantity th e effect of substituents. The optical properties of the compounds have shown the existence of charge transfers at the excited state. The sem iconducting properties of thin films have been investigated in the aim of applications in electronic devices. The photosensibility in symmet rical and unsymmetrical contacts has been studied in visible area.The low junction yield (18%) suggests substantial trapping and recombinati on rate.