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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Poster Session 1 (joint session with BP)

CPP 19.42: Poster

Tuesday, April 1, 2014, 09:30–13:00, P1

Cryogenic Break-Junction Measurements for the Characterization of Organic Molecules — •Thomas Grellmann and Roger Wördenweber — PGI-8, Forschungszentrum Jülich, Deutschland

A cryogenic setup was developed to characterize single organic molecules via the lithographical prepared break-junction technique. Measurements are performed in a helium-flow cryostat, with temperatures ranging from 20K to room temperature. Additionally, a magnetic field up to 0.5T can be applied. The break-junction sample consists of a coated metal substrate with a lithographical prepared gold nano-bridge. Repeated bending of the substrate via a piezo crystal opens and closes the gold-bridge and molecules are trapped between the tips. This allows measuring the conductance and subsequently the IV-spectra of a single molecule. Due to the temperature range from cryogenic to room temperature the conduction mechanisms of molecules can be obtained. Conductance and nonlinear IV-curves of 1,4-Benzenedithiol at different temperatures were measured, and more complex porphyrine molecules are in examination.