First Transistors created, composed of Carbon

Scientists from the University of Texas at Dallas have developed and manufactured prototypes of new transistor, the structure of which is composed entirely of carbon.

Such transistors in the future can be a substitute for traditional silicon transistors, and on that basis it will be possible to create a new generation of computer systems, more efficient and more effective than the present ones.

“The new transistor structure has been used a number of existing nanotechnology in a very unique combination of” – says Dr. Joseph S. Freedman (Joseph S. Friedman), – “Moreover, the new transistor operates on the principles of spintronics, not electronics, as the conventional silicon transistors. ”

First transistors created, composed entirely of carbon

Recall our readers that transistors, which are key components of almost all electronic devices are tiny silicon structure passes through a negatively charged electrons.

These transistors are a type of miniature circuit breakers, skip or not an electric current. But, in addition to the transfer of electrical charge, electrons also possess one parameter, called spin which is related to the magnetic properties of the electron.

And researchers are looking for ways to use the spin of electrons as information carriers, creating new classes of transistors and other devices from the field of spintronics in recent years.

New spintronic transistor created by Dr. Friedman Group, acts as a gate, relying on one of the basic principles of electromagnetism. This principle determines that the electric current flowing through the conductor generates around the conductor the magnetic field.

In addition, an external magnetic field affects the electric current flowing through the conductor. In the traditional silicon transistors, these principles and phenomena can not be used.

In this case the finest graphene nanoribbons used as the conductor (the transistor channel). And as the two control electrodes are used carbon nanotubes disposed on the sides of nanoribbons.

The current flowing through the nanotube in a certain direction, creating around them a magnetic field which, in turn, influences the current flowing through the nanoribbons. Such a structure will create a “multistage” transistors and logic elements composed of a physically unconnected to each other components.

Because the relationship between the graphene nanoribbons carried by electromagnetic waves and not moving electrons, it is, this relationship can be much faster. Such transistors are expected to be able to work at terahertz frequencies.

In addition, the carbon components of such transistors can be made much smaller than the components of silicon transistors, the dimensions of which are already close to the minimum limits defined by some fundamental physical laws.

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