New amorphous semiconducting copolymers containing fluorene and thiophene moieties for organic thin-film transistors
作者:Hoyoul Kong、Dong Hoon Lee、In-Nam Kang、Eunhee Lim、Young Kwan Jung、Jong-Hwa Park、Taek Ahn、Mi Hye Yi、Chan Eon Park、Hong-Ku Shim
DOI:10.1039/b719584b
日期:——
New amorphous semiconducting materials consisting of fluorene-based thiophene copolymers, poly(2-(5-(9,9-dibutyl-9 H-fluoren-2-yl)-3-hexylthiophen-2-yl)-5-(3-hexylthiophen-2-yl)thieno[3,2-b]thiophene) P1 and poly(2-(5-(9,9-dibutyl-9 H-fluoren-2-yl)-4-hexylthiophen-2-yl)-5-(4-hexylthiophen-2-yl)thieno[3,2-b]thiophene) P2, have been successfully synthesized via a palladium-catalyzed Suzuki coupling reaction. The number-average molecular weights (Mn) of P1 and P2 were found to be 18 300, and 15 800, respectively. These polymers dissolve in common organic solvents such as chloroform, chlorobenzene, and toluene. The UV-vis absorption maxima of P1 and P2 appeared at 436 and 427 nm in solution and 441 and 431 nm in the film state, respectively. X-Ray diffraction (XRD) analysis showed no reflection peaks indicating amorphous collections of randomly oriented polymer chains. Atomic force microscopy (AFM) images of P1 and P2 showed amorphous film morphologies. Field-effect transistor mobilities of stable amorphous OTFTs of P1 and P2 under ambient conditions have been achieved up to 5.4 × 10−4 cm2V−1 s−1 and 1.6 × 10−4 cm2V−1 s−1, respectively. The high stability and mobility of fluorene-based thiophene copolymers in the amorphous state make them a new family of promising candidates for organic thin-film transistors.
新型无定形半导体材料由基于氟烯的噻吩共聚物组成,包括聚(2-(5-(9,9-二丁基-9 H-氟烯-2-基)-3-乙基噻吩-2-基)-5-(3-乙基噻吩-2-基)噻吩[3,2-b]噻吩) P1 和聚(2-(5-(9,9-二丁基-9 H-氟烯-2-基)-4-乙基噻吩-2-基)-5-(4-乙基噻吩-2-基)噻吩[3,2-b]噻吩) P2,已通过钯催化的铃木偶联反应成功合成。P1 和 P2 的数均分子量 (Mn) 分别为 18,300 和 15,800。这些聚合物可以溶解于常见有机溶剂中,例如氯仿、氯苯和甲苯。P1 和 P2 在溶液中的紫外-可见吸收峰分别位于 436 nm 和 427 nm,而在薄膜状态下的吸收峰则分别为 441 nm 和 431 nm。X 射线衍射 (XRD) 分析未显示出反射峰,表明聚合链呈无定形的随机取向。P1 和 P2 的原子力显微镜 (AFM) 图像显示出无定形薄膜的形态。P1 和 P2 在环境条件下的稳定无定形 OTFT 迁移率分别达到了 5.4 × 10−4 cm²V−1 s−1 和 1.6 × 10−4 cm²V−1 s−1。基于氟烯的噻吩共聚物在无定形状态下的高稳定性和迁移率使其成为有机薄膜晶体管的新一类有前途的候选材料。