A series of benzo[d,d]thieno[3,2-b;4,5-b]dithiophene (BTDT) derivatives, end-functionalized with phenyl (PBTDT),
benzothiophenyl (BT-BTDT) were synthesized and characterized. A facile, one-pot synthesis of BTDT
was developed which enables the efficient realization of a new
BTDT-based semiconductor series for organic
thin-film transistors (OTFTs). The crystal structure of P-BTDT was determined via single-crystal X-ray
diffraction. Various combinations of surface treatment methods, substrate temperature, and deposition flux rate
sequences have significant effects on device performance. Films deposited on octadecyltrichlorosilane (OTS)-
treated SiO2 substrates under properly adjusted substrate temperature and deposition flux rate achieve an
efficaceous compromise between high film crystallinity and good film grain interconnectivity, resulting in good
OTFT performance, with mobility greater than 0.70 cm2V-1s-1 and Ion/Ioff greater than 108.
We report the synthesis and characterization of perfluorinated tetracene; a material with potential applications in organic electronics. The electrochemical behaviour of the compound is analyzed by differential pulse voltammetry, and compared with that of tetracene. The structure of perfluorotetracene is planar as observed for pentacene. We also report a comparative Raman spectroscopic study of tetracene and perfluorotetracene in relation to their π-conjugational properties. Density functional theory (DFT) calculations have been also performed, at the B3LYP/6-31G** level, to assess information regarding the topologies and energies of the frontier molecular orbitals (MOs) around the gap, and about the vibrational normal modes associated with the Raman features selectively enhanced by the π-conjugation.
We report the characterization of novel oligothienoacenes with five and seven fused thiophene rings; materials with potential applications in organic electronics. The compounds were investigated, both in their neutral and doped forms, by UV-Vis-NIR and FT-Raman spectroscopies. Density functional theory (DFT) calculations have been also performed to assess information regarding the minimum-energy molecular structure, atomic charges distribution, topologies and energies of the frontier molecular orbitals (MOs) around the gap, vibrational normal modes related to the main Raman features, and vertical one-electron excitations giving rise to the main optical absorptions.
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