Researchers build atom-thin 2D thermometers that can be embedded directly in processors — can detect temperature changes in 100 nanoseconds, millions of times faster than the blink of an eye

Source: Tom’s Hardware

Image credit: Jaydyn Isiminger / Penn State

Penn State researchers have developed microscopic temperature sensors that are small enough to embed directly into processor chips, according to a paper published March 6 in Nature Sensors【Nature Sensors】. The sensors, built from a novel class of two‑dimensional materials, can detect temperature changes in 100 nanoseconds—millions of times faster than the blink of an eye—and occupy just one square micrometer, allowing thousands to be placed on a single chip.

Limitations of current temperature sensing

Processors today rely on temperature sensors located outside the chip die, which limits the speed and precision of thermal monitoring. Individual transistors can spike in temperature faster than external sensors can register, forcing chips to apply conservative thermal throttling across entire cores rather than responding to localized hotspots【spike in temperature】.

Design and operation of the 2D sensors

The sensors are built from bimetallic thiophosphates, a two‑dimensional material not previously used in thermal sensing. Its key property is that ions continue moving freely even when an electrical current is applied. While chip engineers normally try to eliminate this ion motion in transistors, the Penn State team exploited it, coupling ion transport for temperature detection with electron transport for reading the thermal data. The result is a sensor that requires no extra circuitry or signal converters and draws up to 80 × less power than conventional silicon‑based thermal sensors.

“What is generally unwanted by industry in transistors is actually great for thermal sensing, so we really tried to exploit that in our design,” said Saptarshi Das, professor of engineering science and mechanics at Penn State and corresponding author of the paper. “Rather than try to remove these ions from this system, we use them to our advantage.”

Potential impact

By integrating sensing directly into the silicon and using the same electrical currents already running through the chip, these atom‑thin thermometers could enable real‑time, localized thermal monitoring. This would allow processors to respond to hotspots more precisely, reducing the need for conservative throttling and potentially improving performance and energy efficiency.