title: Efficient solvent-assisted post-treatment for molecular rearrangement of sprayed polymer field-effect transistors.
abstract: Polymer-based field-effect transistors are fabricated using the gas-assisted spray technique, and their performance is considerably improved when a solvent-assisted post-treatment method, solvent sprayed overlayer (SSO), is used. The SSO method is a unique treatment that can facilitate chain packing to increase crystallinity within the sprayed polymer layers, which inherently have a kinetically trapped amorphous chain morphology with lack of crystallinity due to rapid solvent evaporation. The device performance was drastically improved after SSO relative to conventional post-treatment, thermal annealing (TA). This occurred because SSO can rearrange the polymer chains into a dominantly edge-on crystal orientation, which is preferential for charge transport, whereas TA increases the crystallinity without rearrangement of the crystal orientation resulting in a complex of edge-on and face-on. The development of edge-on crystal domains after SSO within the active layers was responsible for the significant improvement in performance. The SSO is a simple and effective post-treatment method that validates the use of spray process and holds promise for use in other high-throughput processes for OFETs fabrication.
authors.affiliation: Department of Material Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea.
authors.forename: Hye-Yun
authors.initials: HY
authors.lastname: Park
authors.forename: Hoichang
authors.initials: H
authors.lastname: Yang
authors.forename: Si-Kyung
authors.initials: SK
authors.lastname: Choi
authors.forename: Sung-Yeon
authors.initials: SY
authors.lastname: Jang