Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 29: Transport: Poster Session
TT 29.6: Poster
Thursday, September 8, 2022, 15:00–18:00, P1
Electronic transport through single-molecule junctions of photoswitchable diarylethenes — •Valentin Barth1, Lukas Holz1, Thomas Huhn1, Franz Herbst1, Gautam Mitra1, Christopher Weaver2, Sergii Snegir1, Tim Albrecht2, and Elke Scheer1 — 1University of Konstanz, Konstanz, Germany — 2University of Birmingham, Birmingham, UK
Single-molecule junctions represent the conceptually simplest molecular devices. It is important to determine their electronic transport properties. Here we report on the transport characteristics of diarylethene-oligophenylene (DAE-OPE) molecule junctions at room and low temperature [1]. DAE molecules exist in two distinct stable states switched by irradiation of either visible or UV-light. Measurements are executed with the mechanically controllable break junction (MCBJ) method. Connection between the molecule and the gold electrodes is achieved by thiol end groups. The aim of the project is to distinguish the two states by their electrical transport properties. For this purpose, conductance histograms and current-voltage curves are measured separately for both states and compared afterwards. At room temperature, the conductance histograms of the states show small differences. These can be highlighted with the help of dimension reduction methods and neural networks [2]. Molecular vibration modes and thereby the current pathway through the molecule are determined for both states, by Inelastic electron tunneling spectroscopy (IETS).
[1] Sendler et al., Adv. Sci. 2 (2015) 1500017
[2] Albrecht et al., Nanotechnology 28 (2017) 423001