A highly pi-stacked organic semiconductor for field-effect transistors based on linearly condensed pentathienoacene |
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Authors: | 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 |
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Affiliation: | Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P.R. China. |
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Abstract: | 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. |
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