The interaction of electrons with phonons leads to overheating of the phone. Free Technical Library News

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The interaction of electrons with phonons leads to overheating of the phone

24.10.2016

Researchers at the Massachusetts Institute of Technology (USA) have studied the interactions between particles in modern mobile digital devices - phones, tablets, laptops, etc. They found that the interaction of electrons with thermal particles called phonons can lead to the release of a large amount of heat, and sometimes to overheating.

In their experiments, the scientists used precisely timed laser pulses to measure the interaction between electrons and phonons in a very thin silicon wafer. The researchers found that as the concentration of electrons in silicon increases, they begin to destroy phonons and thereby reduce their ability to dissipate heat. "If phonons are scattered by electrons, they are not as good at removing heat. This creates a problem that we need to solve as chips get smaller," Liao said.

On the other hand, scientists say the same effect could be useful in designing thermoelectric generators that convert heat directly into electrical energy. In such devices, the process of phonon scattering can significantly reduce heat loss, significantly increasing their efficiency.

Interestingly, the researchers first began to observe this effect in silicon, which had an electron density of 1019 units. per cubic centimeter - this figure is comparable to or even lower than in some modern transistors.

“In our study, we show that this will be a really big problem when the scale of the circuits gets smaller. Even now, when the size of transistors is a few nanometers, this effect will start to appear, and we really need to seriously consider it, and think about how to use or, conversely, avoid in real devices,” the scientists noted.

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