Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 101: Transport - Poster Session
TT 101.12: Poster
Thursday, April 3, 2014, 15:00–19:00, P2
Transport measurements of diarylethene molecules with long conjugated linkers in solution — •Katharina Luka-Guth1, Daniel Schmid1, Jannic Wolf2, Thomas Huhn2, and Elke Scheer1 — 1Universität Konstanz, FB Physik — 2Universität Konstanz, FB Chemie
We measure the conductance of several different diarylethene molecules via the mechanically controllable break junction (MCBJ) technique at room temperature. Diarylethenes are photochromic molecules that undergo a ring-opening ring-closure reaction upon irradiation with light with suitable wavelength. This reaction changes the conjugation of the pi-system of the molecules that are therefore discussed as optically driven molecular switches. To measure their transport properties, a solution of molecules is directly applied to the gold electrodes in a glass pipette sealed by a PDMS gasket. While opening and closing the MCBJ, molecules get into contact with the electrodes and bridge the gap between two electrodes. Simultaneously the conductance of the molecules is measured, from which conductance histograms are calculated. We compare our results to previous findings. The information is completed by current-voltage characteristics that enable us to determine the position of the current-dominating molecular orbital. We compare our findings with those from previous studies on diarylethenes with shorter linkers [1,2]. Furthermore, we discuss the role of the solvent.
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