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O: Oberflächenphysik

O 12: Nanostrukturen I

O 12.5: Vortrag

Freitag, 4. März 2005, 16:45–17:00, TU EB202

Single-molecule chemical field-effect transistors with nanometer-sized gates: demonstration and tests — •Frank Jäckel¹, Zhaohui Wang², Mark D. Watson^2,3, Klaus Müllen², and Jürgen P. Rabe¹ — ¹Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin, Germany — ²Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany — ³University of Kentucky, Department of Chemistry, Lexington KY 40506-0055, USA

We present a prototypical three-terminal single-molecule device in which the current through a hybrid molecular diode, made from a single molecule in the junction of a scanning tunneling microscope, is modified by the presence of oriented organic charge transfer complexes covalently attached to the molecule in the gap. The set-up represents the first single-molecule transistor with nanometer-sized gates [Phys. Rev. Lett. 92 (2004) 188303]. The observed change in the current-voltage characteristics is explained with an interface dipole originating from the charge transfer complexes. We present tests of this model with respect to the orientation of the dipoles.