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O: Fachverband Oberflächenphysik
O 61: Focus Session: Nanoscale Insights into Interfacial Electrochemistry I
O 61.5: Hauptvortrag
Mittwoch, 14. März 2018, 12:00–12:30, HE 101
Charge Transfer at the Single Molecule Level with Metal and Semiconductor Electrodes — •Richard Nichols1, Andrea Vezzoli1, Richard Brooke2, Nicolò Ferri1, Simon Higgins1, and Walther Schwarzacher2 — 1Department of Chemistry, University of Liverpool, L69 7ZD, UK — 2University of Bristol, Bristol BS8 1TL, UK
We have exploited STM based methods for making single molecule measurements on a wide variety of molecular targets from short molecular bridges to redox active organometallic molecular wires. Such measurements have been made as 2-terminal determinations and also under electrochemical control with electrolytes including ionic liquids. Recently we have extended such measurements to semiconductor electrodes. We have shown that it is possible to make measurements of single molecules connected at one end to gallium arsenide and at the other end to a gold STM tip. Using this methodology we can record current-voltage response of semiconductor-molecule-metal devices and measure the electrical conductance of single molecules in such junctions. As well as showing that it is possible to form single molecule devices contacted to the semiconductor gallium arsenide we have also recently demonstrated that such single molecule devices show a strong photocurrent response. The photo-current response in these junctions can be controlled through the choice of the semiconductor doping density, the molecular bridge and also the light intensity and wavelength. To conclude potential future applications in single-molecule semiconductor (photo-) electrochemistry will be discussed.