New on-chip sensors detect temperature changes in 100 nanoseconds

Researchers at Penn State have developed an ultra-small, 2D-material-based thermometer that can be directly integrated onto computer chips to monitor temperature changes with unprecedented speed and accuracy. These microscopic sensors, smaller than an ant’s antenna and just a few atoms thick, can detect temperature spikes in as little as 100 nanoseconds—millions of times faster than a human blink. This innovation addresses the longstanding challenge of overheating in processors, which degrades performance, by embedding temperature sensing directly within the chip rather than relying on external sensors. The sensors are made from bimetallic thiophosphates, a class of two-dimensional materials that allow ions to move freely even under electrical load. This ion-electron coupling, typically seen as a problem in transistor design, is harnessed here to create highly sensitive, miniaturized thermal sensors that are 100 times smaller and 80 times more power-efficient than current silicon-based systems. Thousands of these sensors can be integrated on a single chip without the need for additional