A single molecule device for mobile phones
Researchers from the Delft University of Technology, Groningen University and the FOM Foundation have designed a single molecule which can act as a useful building block in nanometer-size circuits. 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 realized on the smallest imaginable scale, thus providing an interesting option within the continuing down-scaling of electronic components by the conventional industry. The results are published online this week in Nature Nanotechnology.
Molecules have a typical size of a few nanometers, making them the ultimate limit for down-sizing present-day electronic components, such as diodes, transistors, and so called resonant tunneling devices. Radio-frequency 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.
Pulling
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.
Design rules
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.
More information
Contact: Kees Hummelen
Publication: Large negative differential conductance in single-molecule break junctions
Last modified: | 12 March 2020 9.49 p.m. |
More news
-
05 September 2024
ERC Starting Grants for two UG researchers
Two UG researches, both working at the Faculty of Science and Engineering, have been awarded an ERC Starting Grant: Jingxiu Xie and Gosia Wlodarczyk-Biegun. The European Research Council's (ERC) Starting Grants consist of €1.5 million each, for a...
-
23 July 2024
The chips of the future
Our computers use an unnecessarily large amount of energy, and we are reaching the limits of our current technology. That is why CogniGron is working on new materials that mimic the way the brain computes, and Professor Tamalika Banerjee will...
-
18 July 2024
Smart robots to make smaller chips
A robotic arm in a factory that repeatedly executes the same movement: that’s a thing of the past, states Ming Cao. Researchers of the University of Groningen are collaborating with high-tech companies to make production processes more autonomous.