Speaker: Gregory N. Parsons, NCSU
Date & Time: April 19, 2007 - 11:00am
Location: WR Chemisty 260
Engineering with Electronically Active Molecules
Laboratory for Surface Modification
Gregory N. Parsons, NCSU
11:00am, WR Chemisty 260
Electronic systems made from active organic materials, including polymer solar cells and organic light emitting diodes, are now beginning to replace traditional inorganic semiconductor devices. However, advances will require improved fundamental understanding of the electronic structure at organic/inorganic junctions, as well as new engineering methodologies to reproducibly fabricate materials and contacts at the atomic scale. Recently, our group has developed a unique nanoparticle/molecule junction approach to investigate electronic conduction through molecules and molecular ensembles. Using both alkane and phenylene molecules, we find that thiol, amine and isonitrile end-groups show distinct trends in electronic conduction which provide insight into variations in wavefunction mixing at the molecule/electrode contact and molecular conformation within the measurement structure. In addition, low temperature atomic layer deposition can be performed on molecular-modified surfaces to control the surface energy and enable pattern recognition and reproduction during formation of metal/organic interfaces. These results give insight to control conduction and process chemistry in molecule/metal contacts for a variety of advanced applications.