Ultra-thin Films for Optoelectronic Applications

摘要

Optically active poly(thiophene) with a high regioregularity was synthesized for the first time by using a Rieke zerovalent zinc catalysts. Head to Tail Poly (3-2((S)-2-methylbutoxy) ethylthiophene (HT-P(S)MBET) was an optically active polymer with more than 93% of the Head-to-Tail linkages. For comparison purposes, regiorandom R-P(S)MBET and achiral HT-P(+/-)MBET were also synthesized. They are fully characterized by using proton and carbon 13 NMR spectroscopies, optical rotatory power measurements, circular dichroism, gel permeation chromatography and UV-Vis spectroscopy. Both electrical conductivities and third-order optical nonlinearities were measured in order to examine opto-electronic properties of these ultra-thin films. It was suggested that electrical and optical properties were little affected by chirality. An anisotoropies of electrical conductivity for HT-(P)MBET/SA mixed LB films were in close agreement with results of structural analyses. The electrical and optical properties of HT-P(S)MBET/SA LB films were superior to those of spin- coated films. From these results, it was concluded that the regioregular poly(thiophene)s enhanced opto-electronic properties owing to the extended conjugation length of main polymer chains.