Abstract
The molecular orientation of poly(3-hexylthiophene) (P3HT) thin film on silicon substrate treated with silane coupling agents was evaluated by infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (pMAIRS). It was found that the orientation is altered by interaction between the end group of the silane coupling agent and the P3HT ring. The amino group forming the end group of the silane coupling agent strongly influences the P3HT molecular orientation, causing it to shift to a more perpendicular direction with respect to the substrate.
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