Overheating of smartphones is no longer a big issue… thinks why? A new temperature mapping technology for tiny devices that could help to solve the problem of overheating in smartphones and computers have recently been developed. Plasmon Energy Expansion Thermometry or PEET, is the name of technique that allows temperatures to be mapped in units as small as a nanometre, a unit of measure equal to one-billionth of a metre. It is based on the same physical principles behind the glass-bulb thermometer that was invented by Daniel Gabriel Fahrenheit back in 1724.
This new thermal imaging technique allows engineers to “see” how the temperature changes from point to point inside the smallest electronic circuits said the researchers. The latest microelectronic circuits consist of billions of nanometer-scale transistors. It is important to note that each transistor generates only a tiny bit of heat as it operates. So when several transistors operate at a same time, the computer chips become very hot. And eventually, cell phones and computer become warm. And in the case of computer, it is necessary to ensure that the
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“With the old techniques, measuring the thermal conductivity of a nanowire returns one number. Mapping temperature with PEET, we get 10,000 numbers as we go down the wire,” explained lead researcher Chris Regan, associate professor of physics and astronomy at University of California, Los Angeles. “It is the difference between seeing the score and watching the game – one gives you much better knowledge of the players,” Regan pointed out.
PEET removes the disadvantages of current temperature mapping techniques which includes use one of two thermal imaging techniques: capturing the infrared radiation the device emits or dragging a tiny thermometer back and forth across the device’s surface. Also they both have failed to demonstrate the resolution necessary to “see” the active features in modern transistors, which are typically 22 nanometers across or smaller.
PEET determines temperature in the same way by monitoring changes in density using a transmission electron microscope. The team demonstrated the technique on tiny aluminium wires that were heated on one end. PEET mapping will enable them to heat a transistor and accurately map which parts of it heat up and track how the heat is transported away. This knowledge could help engineers revolutionize the design of the nanoscale electronics inside the next generation of computing devices