Scientists diode from a single molecule

Apr

19

2016

It is researchers from TU Delft managed to make a diode only one molecule wide. The diode has a rectification ratio of 600, which is high for diodes of only a single molecule. A classic diode soon has a value of 10,000 to 100,000.

The diode of a single molecule consists of two benzene rings on both sides, separated by a bridge of ethane. There is no current flows when the energy levels are different on both sides, even though there is a current can flow if the levels are equal on both sides.

In addition to whether or not to run a current, the energy levels can also be adapted with an electric field. This is possible by using a so-called “gate electrode”, says researcher Mickael Perrin on the website of the university. With the electric field of the rectification ratio of the diode can be adjusted from 20.

“The first diode on the basis of a molecule was designed in 2005,” says Perrin. That was when, according to him still quite miserable ‘stop lights. Ran in ‘green’ about ten times as much current through it compared to ‘red’, something you do in the traffic light analogy according to Perrin could call a ‘proper traffic chaos. In previous research, the rectification ratio was not much higher than 15.

The article about the study published in the journal Nanoscale.

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