Conjugated polymer-based organic field-effect transistors have garnered attention since the solution processability of the semiconductor material raises the possibility of lower device fabrication costs, and considerable progress has been made on achieving high mobility systems. Further improvements in charge carrier mobility while using non-specialized deposition techniques and minimizing the volume of semiconductor used in the fabrication process are important considerations for practical implementation. Here, a method of fabricating devices is disclosed that uses a technique (for example, a scalable blade-coating technique) to cast polymer thin film devices from blend solutions with one component being the polymer semiconductor and the other being a commodity polymer. Even when mixing the semiconducting polymer with 90% polystyrene by weight, an average mobility of 2.70.4 cm.sup.2V.sup.1s.sup.1 can be obtained.

According to example embodiments, a method includes dispersing carbon nanotubes in a mixed solution containing a solvent, the carbon nanotubes, and a dispersant, the carbon nanotubes including semiconducting carbon nanotubes, the dispersant comprising a polythiophene derivative including a thiophene ring and a hydrocarbon sidechain linked to the thiophene ring. The hydrocarbon sidechain includes an alkyl group containing a carbon number of 7 or greater. The hydrocarbon sidechain may be regioregularly arranged, and the semiconducting carbon nanotubes are selectively separated from the mixed solution. An electronic device includes semiconducting carbon nanotubes and the foregoing described polythiophene derivative.

The present invention is: a hydrogenated tetracyclododecene-based ring-opening polymer comprising a repeating unit (A) derived from tetracyclododecene in a ratio of 40 wt % or more based on a total amount of repeating units, a ratio of meso diads in the repeating unit (A) being 65% or more; and a method for producing the same. By means of the present invention, provided are: a crystalline hydrogenated tetracyclododecene-based ring-opening polymer having a high melting point and a high glass transition temperature, and exhibiting excellent heat resistance and excellent processability even after forming due to melt forming; and a method for producing the same.