Spontaneous Defect-Removal in Uniaxially Aligned Poly(3-hexylthiophene) by Molecular <em>p</em>-Doping
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초록
내용
Charge-transfer doping is a convenient method to enhance the electrical conductivity of the semiconducting polymer. However, not much is studied about the structural effects of doping. Specifically, using 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) with poly(3-hexylthiophene) (P3HT) is well known as an optimal dopant for P3HT, enhances its conductive properties. Our group previously developed a eutectic frictional transfer method to produce high-crystallinity P3HT films. This study integrated charge-transfer doping into these films through sequential doping, achieving strong anisotropic properties as evidenced by polarized UV, FT-IR, and Raman spectroscopy. Remarkably, molecular p-doping not only preserves but enhances the backbone planarity of the polymer, attributed to a defect-curing effect induced by the dopants. Also, this doped film exhibits exceptional electrical conductivity, reaching up to 25 S/cm, much higher than the conventional spin-casted film.