Abstract
The crystal structure of thin π-conjugated polymer films is critical to their performance. Here, we utilized regio-regular poly (3-hexylthiophene-2,5-diyl) (P3HT) films as a model system with grazing incident X-ray diffraction (GIXD) characterization. We systematically studied the effects of solvent polarity on the control of the crystal structure of thin π-conjugated polymer films in mixed solvent immersion. The polarity of poor solvents plays an important role in the crystallization behavior of the films, and the polarity of good solvents slightly influences the crystallization behavior of the thin P3HT films. Non-polar poor solvents increase the crystallinity of thin π-conjugated P3HT films by producing new crystalline nuclei in the thin polymer films; however, polar poor solvents can improve crystallinity via crystal growth. The results of this work offer a better understanding of the crystallization behavior of thin π-conjugated polymer films induced by liquid mixtures. The results offer important insight into solvent immersion control technologies.
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