Fabrication of stretch-oriented regioregular poly(3-hexylthiophene) film and its application to organic field-effect transistors

Abstract

We report a fabrication process for organic field-effect transistors (OFETs) based on stretch-oriented regioregular poly(3-hcxylthiophene) (rr-P3HT) film and the anisotropic Carrier transport properties in the OFETs. The optlCal absorptlOn spectra and XRD results indicate that πconjugated rr-P3HT chains are aligned in the stretching direction With the πstacking polymer planes parallel to the substrate. The field-effect hole mobility ln a Current flow parallel to the stretching direction is larger by a factor of 3.4 compared to that perpendicular to the stretching direction. These results indicate that Charge transport via the π-conjugated rr-P3HT chains is advantageous in the stretch-oriented rr-P3HT film. © 2009 CPST.