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Microchips with built-in cooling systems could help make electronic devices that are more compact and efficient.

The density of transistors on microchips 鈥� and thus the speed and capability of devices such as computers and smartphones 鈥� has grown rapidly over the past few decades. But as we cram more transistors together, microchips get warmer, which could eventually limit this trend, says Elison Matioli at the Swiss Federal Institute of Technology in Lausanne.

We currently use heat sinks to cool microchips, a piece of metal that conducts heat and releases it into the air. This process is often sped up using fans, such as those found in most laptops, or other cooling systems, such as air conditioning in data centres.

Because heat sinks are much bulkier and heavier than the microchips themselves, they are a key limiting factor in making electronic devices lighter and more compact. 鈥淭his is a major challenge,鈥� says Matioli.

To tackle this, he and his colleagues developed a microscopic network of pipes that is embedded into the microchip itself, doing away with the need for heat sinks and other external cooling mechanisms. The pipes remove heat at the source by pumping a tiny volume of water through the microchip.

In a test, the team found that the self-cooling microchip had a cooling power 50 times greater than that using conventional cooling methods. 鈥淭hat we actually could do it and that it worked this well, it was quite a nice surprise,鈥� says Matioli.

Without heat sinks taking up space, it will be possible to develop more efficient devices, which could significantly reduce their electrical consumption and cost of running, says Tiwei Wei at KU Leuven in Belgium.

It could also drastically reduce the environmental footprint of data centres, says Matioli. In 2018, data centres globally about 75 terawatt hours of electricity for infrastructure systems, including cooling.

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