Third-order optical susceptibility in polythiophene thin films prepared by spin-coating from high-boiling-point solvents

摘要

We examined the enhancements in the third-order optical susceptibility (x~((3))) of spin-coated thin films of poly(3-hexylthiophene) using an anhydrous solvent with a high boiling point. The x~((3)) value was found to be enhanced as the boiling point of the solvent increased. In this study, the largest value of x~((3)) was obtained for thin films that were spin-coated in an inert atmosphere using anhydrous dichloro-benzene and then was subsequently exposed to its vapor for 1 h. The maximum value of the imaginary part of x~((3)) was determined to be 1.8 × 10~(-9) esu, which is more than three times greater than that of thin films spin-coated in an ambient atmosphere using a solvent with a low boiling point, such as chloroform.