Researchers at the University of Illinois were able to measure the temperature of the transistors designed using graphene and noticed that some areas compensate for cold temperature increase related to the operation. Graphene transistors are still poorly understood. To recap, the graphene sheet is a carbon atom thick structure with a honeycomb.
The scientists used a lever atomic force microscope to measure the temperature at various locations where the transistor was in operation and there is a very interesting discovery. In a silicon transistor, some thermoelectric effects at the junction between silicon and metal connections, causing a drop in temperature.
Nevertheless, the increase in temperature generated by the collision of electrons with various materials (ohmic heating) cancels any widely declines. That's why the operating frequency of a transistor is limited by its temperature and cooling systems are needed. In a transistor, graphene, we observe the same thermoelectric effects.
Nevertheless, the drop in temperature at the junction is large enough, in some cases, to cool the transistor and compensate ohmic heating generated. It is important to step back. These results show that graphene transistors are very promising. They do not show how to reproduce the effect in a model that can be mass produced and integrated in processors today.
The U.S. Department of Defense has funded part of this research.
The scientists used a lever atomic force microscope to measure the temperature at various locations where the transistor was in operation and there is a very interesting discovery. In a silicon transistor, some thermoelectric effects at the junction between silicon and metal connections, causing a drop in temperature.
Nevertheless, the increase in temperature generated by the collision of electrons with various materials (ohmic heating) cancels any widely declines. That's why the operating frequency of a transistor is limited by its temperature and cooling systems are needed. In a transistor, graphene, we observe the same thermoelectric effects.
Nevertheless, the drop in temperature at the junction is large enough, in some cases, to cool the transistor and compensate ohmic heating generated. It is important to step back. These results show that graphene transistors are very promising. They do not show how to reproduce the effect in a model that can be mass produced and integrated in processors today.
The U.S. Department of Defense has funded part of this research.
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- Speedier Nanotube Circuits (08/04/2011)
- Graphene transistor shines on diamond-like substrate (07/04/2011)
- Application of Graphene to High-Speed Transistors: Expectations and Challenges (07/04/2011)
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