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서로 다른 위치 규칙성을 가지는 두 개의 Poly(3-hexylthiophene) 공액 고분자를 기반으로 한 고분자 복합 박막의 구조와 전기적 특성에 대한 연구
정강훈,Nann Aye Mya Mya Phu,박래수,윤정우,고영운,장민철,Ganghoon Jeong,Nann Aye Mya Mya Phu,Rae-Su Park,Jeong Woo Yun,Yeongun Ko,Mincheol Chang 한국복합재료학회 2023 Composites research Vol.36 No.5
Poly(3-hexylthiophene) (P3HT) is a conjugated polymer that is highly soluble in organic solvents and is readily available. However, its electrical properties as an active channel in electronic devices are not enough for practical applications, necessitating further improvement in the properties. In this study, we demonstrate that the blending of two P3HT polymers (i.e., regio-regular (RR) P3HT and regio-random (RRa) P3HT) with different regioregularities can significantly improve charge transport characteristics of the blend films. The morphological and electrical properties of the blend films were systematically investigated by varying the ratio between two P3HT polymers. Atomic force microscopy (AFM), X-ray diffraction (XRD), and UV-visible absorption spectroscopy (UV-vis) were employed to evaluate the morphological and optoelectronic properties of the blend films. The crystallinity of the blend films increased with increasing the content of RRa-P3HT to 20 wt% and gradually decreased as the content increased to 80%. Consistently, the highest charge carrier mobility was obtained from the blend films containing 20 wt% RRa-P3HT, which value was measured to be 0.029 cm<sup>2</sup>/V·s. The values gradually decreased to 0.0007 cm<sup>2</sup>/V·s with increasing the content of RRa-P3HT to 80 wt%.