7:15 PM - 7:30 PM
▲ [18p-D102-23] Large area molecular orientation of conjugated polymers by ribbon-shaped FTM and its implication on anisotropic carrier transport
Keywords:Floating Film Transfer Method, Orientation, Thin Film, OFET, Charge Transport
Semiconducting conjugated polymers (CPs) with solution processability have potentiality for the practical realization of low cost organic electronic devices like solar Cell, light emitting diodes and field effect transistors (FETs) etc. Extended π-conjugation in one-dimensional CPs favors the carrier transport along the polymeric main chain and demands for molecular orientation in order to facilitate the carrier transport. Our group developed a novel floating film transfer method (FTM) for the fabrication of oriented thin films of CPs, which avoid the mechanical damage, and solubility under-layer along with the least material wastage. Recently we extended our conventional FTM by providing directionality during spreading with the help of our custom-made slider leading to the very large area Ribbon shaped FTM. In this study, ribbon shaped FTM has been utilized to fabricate large are oriented thin films of various CPs followed by their optoelectronics characterizations.
Oriented thin films CPs like PQT, F8T2, non-regiocontrolled P3HT, PBTTT and PTB7 have been used as active semiconductor of OFETs in bottom gate-top contact device architecture. An optimized film fabrication condition of EG/GL-3:1 as liquid substrate, casting temperature of 60oC and polymer concentration 1% w/w in chloroform was used for all of the CPs under investigation1.
It has been observed that all of the CPs led to the fabrication of very large area oriented thin films (20 cm x 2 cm) under ribbon shaped FTM. All of the CPs under investigation have been oriented well and exhibited optical dichroic ratio 2-5 along with the field effect mobility varying between 5×10-2 to 1.9×10-4 cm2/vs in case of parallel orientation. Amongst the various CPs utilized, PQT demonstrated the highest field effect mobility of 5×10-2 cm2/vs and high Ion/Ioff ratio of 106 as shown in the Fig:1. Detailed optoelectronic characterizations and charge transport properties will discuss during my presentation.
Oriented thin films CPs like PQT, F8T2, non-regiocontrolled P3HT, PBTTT and PTB7 have been used as active semiconductor of OFETs in bottom gate-top contact device architecture. An optimized film fabrication condition of EG/GL-3:1 as liquid substrate, casting temperature of 60oC and polymer concentration 1% w/w in chloroform was used for all of the CPs under investigation1.
It has been observed that all of the CPs led to the fabrication of very large area oriented thin films (20 cm x 2 cm) under ribbon shaped FTM. All of the CPs under investigation have been oriented well and exhibited optical dichroic ratio 2-5 along with the field effect mobility varying between 5×10-2 to 1.9×10-4 cm2/vs in case of parallel orientation. Amongst the various CPs utilized, PQT demonstrated the highest field effect mobility of 5×10-2 cm2/vs and high Ion/Ioff ratio of 106 as shown in the Fig:1. Detailed optoelectronic characterizations and charge transport properties will discuss during my presentation.