3:00 PM - 3:15 PM
▲ [14p-313-7] Ribbon-shaped floating-film of polythiophene-based conjugated polymers for orientation analysis
Keywords:Molecular orientation, casting method, conjugated polymer
Solution processed thin films organic semiconductors with controlled optimum morphology is a key feature required for organic electronics. The thin-film fabrication of organic conjugated polymers (CP) with controlled morphology is, therefore, highly desired since it is very sensitive on processing conditions due to the one-dimensionality of p-conjugation. Our group has developed a unique thin film casting procedure to obtain highly oriented thin-films of CPs on liquid-substrate, named as the dynamic casting of floating-film and transfer method (dynamic-FTM). In general casting of thin films under dynamic FTM leads to the circularly casted and oriented floating-film with large distribution of orientation and hampers the in-depth analysis of orientation. Herein, we would like to propose casting of Ribbon-shaped floating-film under dynamic-FTM having very large scale orientation using thiophene-based CPs for detailed orientation analysis. We have used two types of CPs, namely, non-regiocontrolled poly(3-hexylthiophene) (NR-P3HT) and poly(dodecyl-quaterthiophene) (PQT) in this study. Various casting conditions, such as viscosity of liquid-substrate, casting temperature, concentration of solution are chosen for investigating the orientation characteristics.
The left figure shows the liquid-substrate dependence of the orientation characteristics of NR-P3HT. A quite similar results to that of conventional FTM were although seen here in combination existence of molecular orientation up 15-20 cm. Right figure shows the location dependence of their orientation characteristics exhibiting that distribution of orientation intensity and the thickness (absorption intensity). Interestingly PQT rather exhibits much improved orientation. Detailed results pertaining to the analysis of orientation characteristics from the Ribbon-shaped floating-films will be presented.
The left figure shows the liquid-substrate dependence of the orientation characteristics of NR-P3HT. A quite similar results to that of conventional FTM were although seen here in combination existence of molecular orientation up 15-20 cm. Right figure shows the location dependence of their orientation characteristics exhibiting that distribution of orientation intensity and the thickness (absorption intensity). Interestingly PQT rather exhibits much improved orientation. Detailed results pertaining to the analysis of orientation characteristics from the Ribbon-shaped floating-films will be presented.