INFLUENCE OF STEREOREGULARITY ON THE PHOTOINITIATED ELECTRICAL-CONDUCTIVITY OF POLY(3-ALKYLTHIOPHENES)

Several kinds of synthesis methods leading to regio and stereo chemica l control of polymer architecture and also to polymers derived from ol igomers possessing internal symmetry or containing suitably spaced alk yl chains have been performed. The different structures have been stud ied in relation to their electrical conductivity behaviour. Doping of polymers has been photoinitiated with optically dissociative materials (triarylsulfonium salts) which were incorporated with the basic poly( 3-alkylthiophene) polymer into the spinning solution. Conditions of li ght exposure (wavelength range, exposure dose) and concentration of ph otodopant used have been optimized in order to enhance the electrical conductivity and its thermal stability. High-resolution conducting pat terns have been realized by microlithography techniques. Their possibl e use in microelectronics is investigated.