Molecular modelling Positionspapier im Rahmen der 'Analyse und Bewertung neuer innovativer Ansaetze in der chemischen Grundlagenforschung'

SIGLEAvailable from TIB Hannover: F95B1866 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Molekularelektronik - Muster selbstorganisierender Molekuele. Teilvorhaben: Herstellung, Charakterisierung und Manipulation von Mustern selbstorganisierender Molekuele Schlussbericht

The question at the beginning of the project was, whether it is possible to fabricate an electronic device based on single molecules. In order to answer this question, conjugated macromolecules were self-assembled in two-dimensional arrays on ultraflat solid substrates. In the scanning tunneling microscope (STM) currents through various molecular segments were measured in well defined environments. Also the current through conjugated, end-functionalized polymers was measured between two nanoelectrodes on a silicon wafer at a distance of less than 10 nm. A key result is the first measurement of current-voltage characteristics through a single molecule (alkylated hexabenzocoronene) at submolecular resolution, which showed that it is possible to obtain a diode-like I-V characteristic with a single aromatic molecule contacted by a conducting substrate and the STM tip. Moreover a simple method was found in order to self-assemble oriented ribbons of conjugated macromolecules on insulators. The cross-section of the ribbons is given by the dimension of single molecules, i.e. in the range of a few nanometers. The ribbons are suitable candidates for 'nanowires', which may bridge conventional microelectronic structures. (orig.)Available from TIB Hannover: DtF QN1(70,41) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman