Anyone who has used a laptop that becomes too hot to touch knows that heat is one of the biggest challenges in modern electronics.
The same problem affects powerful computer servers and data centers, where keeping machines cool requires huge amounts of electricity. As computer chips continue to become smaller and more powerful, managing heat is becoming even more difficult.
Now, researchers at the Massachusetts Institute of Technology (MIT) have developed a new way to watch heat move through electronic devices.
Their technique could help engineers design faster, more efficient chips for artificial intelligence, wearable technology, smartphones, and clean energy systems.
The study was published in the journal Nature Communications.
Modern computer chips are made from many thin layers of different materials stacked together. As electricity flows through these layers, heat builds up. If the heat cannot escape quickly enough, the chip can slow down, become less reliable, or even fail.
Understanding exactly how heat moves inside these complex structures is essential, but existing tools have important limitations. Some methods can only measure heat at the surface, while others cannot capture the tiny, rapid changes that happen inside the chip. Most techniques also struggle to separate what is happening in each individual layer.
To solve this problem, the MIT team created a new approach that combines ultrafast laser pulses with one of the world’s brightest X-ray sources.
The laser briefly heats a tiny area of the material, while the X-rays pass through multiple layers and track how the heat spreads over time. Because X-rays can penetrate deep into the device, the researchers can see what is happening inside instead of only at the surface.
The new method is so sensitive that it can detect changes caused by defects just a few millionths of a meter across.
To test the technique, the team examined an experimental electronic device made from gallium nitride placed on top of silicon. Gallium nitride is considered one of the most promising materials for future high-performance electronics because it can handle high power and transfer heat efficiently.
However, the researchers discovered that even a tiny wrinkle-like defect dramatically affected heat movement. At the defect, the material transferred heat four times less effectively than expected. Heat also spread unevenly, flowing more easily in one direction than the other.
These findings surprised the researchers because computer models often assume that materials are perfect crystals without flaws. In reality, small defects are common during manufacturing and can significantly reduce a chip’s ability to stay cool.
By revealing these hidden weak spots, the new technique could help engineers identify problems before they become serious.
The researchers believe the technology could become a valuable tool for the semiconductor industry. In fact, they say a major semiconductor industry consortium has already expressed interest in working with them to apply the method to a wider range of computer chips.
Beyond simply measuring heat, the technique allows scientists to observe how different materials, layer designs, and manufacturing methods affect cooling performance in real devices.
As computer processors continue to power increasingly demanding technologies such as artificial intelligence and advanced data centers, keeping chips cool will become even more important.
This new imaging method gives researchers an unprecedented view of how heat travels inside electronics and could lead to smarter chip designs that run faster, last longer, and use energy more efficiently.
