A single-molecule diode

Beitrag in einer Fachzeitschrift

Details zur Publikation

Autorinnen und Autoren: Elbing M, Ochs R, Koentopp M, Fischer M, von Hänisch C, Weigend F, Evers F, Weber HB, Mayor M
Zeitschrift: Proceedings of the National Academy of Sciences of the United States of America
Verlag: National Academy of Sciences
Jahr der Veröffentlichung: 2005
Band: 102
Heftnummer: 25
Seitenbereich: 8815-8820
ISSN: 0027-8424
eISSN: 1091-6490


We have designed and synthesized a molecular rod that consists of two weakly coupled electronic pi-systems with mutually shifted energy levels. The asymmetry thus implied manifests itself in a current-voltage characteristic with pronounced dependence on the sign of the bias voltage, which makes the molecule a prototype for a molecular diode. The individual molecules were immobilized by sulfur-gold bonds between both electrodes of a mechanically controlled break junction, and their electronic transport properties have been investigated. The results indeed show diode-like current-voltage characteristics. In contrast to that, control experiments with symmetric molecular rods consisting of two identical pi-systems did not show significant asymmetries in the transport properties. To investigate the underlying transport mechanism, phenomenological arguments are combined with calculations based on density functional theory. The theoretical analysis suggests that the bias dependence of the polarizability of the molecule feeds back into the current leading to an asymmetric shape of the current-voltage characteristics, similar to the phenomena in a semiconductor diode.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Weber, Heiko B. Prof. Dr.
Lehrstuhl für Angewandte Physik

Einrichtungen weiterer Autorinnen und Autoren

Karlsruhe Institute of Technology (KIT)
Universität Basel


Elektronentransport auf molekularer Skala (Prof. Weber)
Lehrstuhl für Angewandte Physik


Elbing, M., Ochs, R., Koentopp, M., Fischer, M., von Hänisch, C., Weigend, F.,... Mayor, M. (2005). A single-molecule diode. Proceedings of the National Academy of Sciences of the United States of America, 102(25), 8815-8820. https://dx.doi.org/10.1073/pnas.0408888102

Elbing, Mark, et al. "A single-molecule diode." Proceedings of the National Academy of Sciences of the United States of America 102.25 (2005): 8815-8820.


Zuletzt aktualisiert 2019-06-08 um 09:02