Crystallinity Transfer of Growth-Rate Controlled P3HT Nanowires from a Solution to Thin-Film
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Conjugated polymer (CP) nanowires (NWs) have significant attention in optoelectronic applications such as organic thin-film transistors (TFTs) and solar cells. The crystalline NWs using a proper solvent system ensures solution-processable devices with high performance. Herein, we report a facile strategy to fabricate crystalline NWs, where the crystal growth rate was controlled by various mixing methods of good and poor solvents for the poly(3-hexylthiophene). The solvent pairs were selected based on their solubility parameters. Though non-solvents were applied, a controlled crystallization rate provided well-defined NWs. The interactions between solvents and substrates affected the performance of TFTs. The differences in the surface energies and boiling points of the using solvents were considered. The NW-based thin-film may provide a useful strategy that does not require post-annealings for manufacturing flexible devices with increased crystallinity and improved carrier mobility.