Dioxaborines as organic n-semiconductors, process for the production of semiconductors utilizing dioxaborines, and semiconductor component, field effect transistor, and diode having a dioxaborine
申请人:Halik Marcus
公开号:US20070179299A1
公开(公告)日:2007-08-02
Dioxaborines as organic n-semiconductors, a process for the production of semiconductors utilizing dioxaborines, and a semiconductor component, a field effect transistor, and a diode having a dioxaborine are provided. Dioxaborines have a conjugated π-system that carries two terminal six-membered dioxaborine heterocycles that are electronically linked to one another via the central π-system. The compounds have good electron mobility and very good reversibility of redox behavior and are therefore suitable as organic semiconductors in electronic semiconductor components. Processes for manufacturing the electronic semiconductor components utilize the dioxabroines.
A Polystyrene−Oligothiophene−Polystyrene Triblock Copolymer
作者:Mark A. Hempenius、Bea M. W. Langeveld-Voss、John A. E. H. van Haare、Rene A. J. Janssen、Sergei S. Sheiko、Joachim P. Spatz、Martin Möller、E. W. Meijer
DOI:10.1021/ja972910v
日期:1998.4.1
A well-defined triblock copolymer is synthesized by using a strategy in which the alpha-coupling of 11 thiophene rings of the middle block and the monodispersity (DP = 30 and (M) over bar(w)/(M) over bar(n), = 1.1) of the two polystyrene outer blocks is ensured. Monofunctional polystyrene 1 is first modified with an alpha-terthiophene unit 2 to form 3, and two of these units are coupled in a double Stetter reaction of 4 with a difunctional alpha-terthiophene 5 to yield a tetraketone 6 as the precursor of the triblock copolymer, which was formed with excess Lawesson's reagent. The polymer 7 is fully characterized with IR and NMR spectroscopy and MALDI-TOF mass spectrometry. Size exclusion chromatography, transmission electron microscopy, and scanning force microscopy show that 7 is self-assembled into spherical, micellar structures with average diameters of 12 nm, which corresponds to about 60 block copolymer molecules per aggregate. The optical properties of 7 are in full agreement with an associated unsubstituted oligothiophene. Electrochemical doping is hampered by the polystyrene shell; however, chemical doping afforded small nanoscopic charged aggregates that are soluble in organic solvents.