Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.30: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Exploring coherent transport through π-stacked systems in molecular electronic devices — •Qian Li1, Gemma Solomon1, Gediminas Kirsanskas2, Karsten Flensberg2, and Martin Leijnse3 — 1Nano Science Center and Department of Chemistry, University of Copenhagen, Denmark — 2Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Denmark — 3The Division of Solid State Physics, Lund University, Sweden
Understanding electron transport across π-stacked systems will help to elucidate intermolecular tunneling in molecular junctions and in the design of effective molecular devices. Here we show how conjugation length and substituent groups influence the electron transport and thermoelectric response in the π-stacked structures by investigating five representative stacked molecular junctions. We found that a π-stacked system of two substituted anthracenes exhibit good thermopower and a high power factor, suggesting that increased conjugation can enhance thermoelectric response. The fully eclipsed structure of quinhydrone exhibits high power factor at the minimum energy structure and could be a better candidate in a thermoelectric device, compared with the other π-stacked systems considered.