Xiao Kai, Liu Yunqi, Qi Ting, Zhang Wei, Wang Fang, Gao Jianhua, Qiu Wenfeng, Ma Yongqiang, Cui Guanglei, Chen Shiyan, Zhan Xiaowei, Yu Gui, Qin Jingui, Hu Wenping, Zhu Daoben
Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P.R. China.
J Am Chem Soc. 2005 Sep 28;127(38):13281-6. doi: 10.1021/ja052816b.
We present the synthesis and characterization of a fused-ring compound, dithieno[2,3-d:2',3'-d']thieno[3,2-b:4,5-b']dithiophene (pentathienoacene, PTA). In contrast to pentacene, PTA has a larger band gap than most semiconductors used in organic field-effect transistors (OFETs) and therefore is expected to be stable in air. The large pi-conjugated and planar molecular structure of PTA would also form higher molecular orders that are conductive for carrier transport. X-ray diffraction and atomic force microscopy experiments on its films show that the molecules stack in layers with their long axis upright from the surface. X-ray photoelectron spectroscopy suggests that there are no chemical bonds at the PTA/Au interface. OFETs based on the PTA have been constructed, and their performances as p-type semiconductors are also presented. A high mobility of 0.045 cm(2)/V s and an on/off ratio of 10(3) for a PTA OFET have been achieved, demonstrating the potential of PTA for application in future organic electronics.
我们展示了一种稠环化合物二噻吩并[2,3 - d:2',3'- d']噻吩并[3,2 - b:4,5 - b']二噻吩(并五噻吩,PTA)的合成与表征。与并五苯相比,PTA的带隙比大多数用于有机场效应晶体管(OFET)的半导体更大,因此预计在空气中稳定。PTA的大π共轭平面分子结构也会形成有利于载流子传输的更高分子有序排列。对其薄膜进行的X射线衍射和原子力显微镜实验表明,分子以长轴垂直于表面的方式分层堆积。X射线光电子能谱表明在PTA/金界面不存在化学键。基于PTA构建了OFET,并展示了它们作为p型半导体的性能。对于一个PTA OFET,实现了0.045 cm²/V s的高迁移率和10³的开/关比,证明了PTA在未来有机电子学中的应用潜力。