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 quantify the effect of substituents. The optical properties of the compounds have shown the existence of charge transfers at the excited state. The semiconducting properties of thin films have been investigated in the aim of applications in electronic devices. The photosensiblity in symmetrical and unsymmetrical contacts has been studied in visible area. The low junction yield (18%) suggests substantial trapping and recombination rate