SELF-ORGANIZATION AND ELECTRICAL-PROPERTIES OF HEAD-TO-TAIL POLY(3-HEXYLTHIOPHENE) IN LANGMUIR-BLODGETT-FILMS

The conductive ultra thin films were fabricated from mixed monolayers containing stearic acid and Head-to-Tail poly(3-alkylthiophene). These films exhibited well-defined layered structures as determined by opti cal absorption and X-ray diffraction measurements. The UV-Vis absorpti on spectra of these films showed lower energy absorption shifts of 48 nm from that of the random poly(3-alkylthiophene)/stearic acid LB film s. The blue shift of absorption maximum of the LB film is attributed t o the increase of pi-conjugation length caused by no steric hindrance of alkyl side chains. The conductivity of the Head-to-Tail poly(3-hexy lthiophene)/stearic acid LB films was greatly improved in the range of 67-100 S/cm.