Effects of Solution-state Crystallinity and Solution-wetting on the Performance of the Conjugated Polymer-based Transisto

Abstract

Conjugated polymer (CP) has received great attention due to applications for in biosensor, organic field effect transistor (OFET), organic light-emitting diodes, and organic solar cells. Among various type of CPs, poly(3-hexylthiophene) (P3HT) has been extensively studied due to the solution processability in organic solvent and relatively high charge carrier mobility. Particularly, it is well known that degree of crystallinity of self-assembled P3HT is determined by molecular parameters and processing conditions. In this study, we developed the simple process to produce 1D self-crystallized P3HT nanostructures by regulating the mixing rate of good and orthogonal solvents. Also, we investigated the effect of orthogonal solvents with different solubility parameters on the crystalline properties of P3HT thin film. Each self-crystallized P3HT nanostructure was characterized by correlation with nanostructures observed by TEM, crystallinity of P3HT chains measured by x-ray scattering and field-effect mobility of OFET.