Nano Science Center, University of Copenhagen
Organic molecules in electronic devices
Organic molecules are becoming increasingly important as the active component
in electronic devices both in the form of low-tech high market volume
applications (e.g. organic light emitting diodes) and, on a single molecule
level, in basic research test systems. In both cases the ability to structurally
organize and inter-connect the molecular constituents is a central issue, which
requires a successful combination of molecular self-organization and
lithography. The talk will highlight recent results on single molecule single
electron transistors (1), self-assembly of gold nanoparticles into molecular
electronic circuitry (2-5), structural nanoscale studies of self-assembled
biologically relevant systems (5-6), self-organized electronic thin films (7),
and organic synthesis of thiol end-capped p-systems (8). Our most recent results
on electrical transport at 4 Kelvin through a single oligo-p-phenylenevinylene
molecule placed in a gap of about 2 nm between source and drain electrode of a
single electron transistor device (SET) will be given special emphasis (1). The
measurements reveal for the first time the relation between transistor
characteristics and the position of the molecular redox states which are
strongly influenced by image charges in the electrodes.
 S. Kubatkin, T. Bj�rnholm et al. Nature 425 698 (2003).
 T. Hassenkan, M. Brust, T. Bj�rnholm et al. Adv. Mat. 14 1126-1130 (2002).
 K. N�rgaard, M. Brust, T. Bj�rnholm et al. Faraday Discussions 125 221-233 (2004).
 T. Hassenkam, T. Bj�rnholm et al. Nano Letters 4 19 (2004)
 T. R. Jensen, K. Kj�r, T. Bj�rnholm et al. Phys. Rev. Lett. 90 086101 (2003); P. Ball, News & Views, Nature 423 25-26 (2003).
 L. K. Nielsen, T. Bj�rnholm, O.G. Mouritsen, Nature 404 352 (2000).
 B. W. Lauersen, T. Bj�rnholm, et al. Langmuir, in press (2004).
 N. Stuhr-Hansen, T. Bj�rnholm et al. J. Org. Chem. 68 1275 (2003).