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Single molecule device acts as building block for cellphones

04 Sep 2014  | Ans Hekkenberg

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A team of researchers from the Delft University of Technology, Groningen University and the FOM Foundation has developed a single molecule that can act as a useful building block in nanometre-size circuits. According to them, they found that the molecule functions as a resonant tunneling device, an essential component in mobile phones and WiFi.

In conventional semiconductor technology, these devices have a complicated design consisting of several layers of different materials. This is the first time that such a device has been realised on the smallest imaginable scale, thus providing an interesting option within the continuing down-scaling of electronic components by the conventional industry.

Resonant tunneling device based on a single molecule

Resonant tunneling device based on a single molecule: initially starting from zero, the current increases with voltage. However, for higher voltages, the current decreases thereby showing negative differential resistance. The calculated drawn red line is in good agreement with the data. Credit: Fundamental Research on Matter (FOM)

Molecules have a typical size of a few nanometres, making them the ultimate limit for down-sizing present-day electronic components such as diodes, transistors and so called resonant tunneling devices. RF electronics, as for instance used in mobile phones and WiFi, rely on the use of resonant tunneling devices. These devices exhibit negative differential conductance, which means that an increase in voltage across the device results in a decrease in electric current through it. This effect can be used to amplify electric signals.

The negative differential conductance measured in the single molecule considered by the research teams in Delft and Groningen, was very prominent and tunable by mechanically manipulating the molecule. The degree of bending of the molecule could be varied by pulling at it by adjusting the distance between the electrodes to which the molecule is attached.

Trapping of a molecule between two gold electrodes

The trapping of a molecule between two gold electrodes: When measuring at the same time the current through the molecule, negative differential resistance appears. The molecular structure is calculated in every step based on the forces between the atoms.

From these observations new design rules were derived for implementing complex electronic functionalities in single molecules. As a result, the researchers were able to demonstrate the smallest known resonant tunneling device with a pronounced negative differential conductance. Moreover, the results pave the way for the design of an efficient single-molecule rectifier (which converts AC into DC). It can be built based on the same resonant tunneling principle.

This research was carried out with financial support from the FOM Foundation, NWO/OCW and the European FP7-framework programme.

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