title: A highly pi-stacked organic semiconductor for field-effect transistors based on linearly condensed pentathienoacene.
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.
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P.R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Xiao
authors.forename: Yunqi
authors.initials: Y
authors.lastname: Liu
authors.forename: Ting
authors.initials: T
authors.lastname: Qi
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Jianhua
authors.initials: J
authors.lastname: Gao
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Qiu
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Ma
authors.forename: Guanglei
authors.initials: G
authors.lastname: Cui
authors.forename: Shiyan
authors.initials: S
authors.lastname: Chen
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Zhan
authors.forename: Gui
authors.initials: G
authors.lastname: Yu
authors.forename: Jingui
authors.initials: J
authors.lastname: Qin
authors.forename: Wenping
authors.initials: W
authors.lastname: Hu
authors.forename: Daoben
authors.initials: D
authors.lastname: Zhu
mesh_terms: D004553:Electric Conductivity; D018625:Microscopy, Atomic Force; D015394:Molecular Structure; D012666:Semiconductors; D013696:Temperature; D013876:Thiophenes / Q000138:chemical synthesis / Q000737:chemistry*; D014173:Transistors, Electronic
chemical_list: D013876:Thiophenes; C505705:dithieno(2,3-d-2',3'-d')thieno(3,2-b:4,5-b')dithiophene