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World’s most efficient semiconductor material for thermal management developed by UCLA engineers

Researchers at the UCLA Samueli School of Engineering have developed a new semiconductor material — defect-free boron arsenide — that is more effective at drawing and dissipating waste heat than any other known semiconductor or metal materials.

Rendering of a computer chip with a hot spot (bottom), an electron microscope image of defect-free boron arsenide (middle) and an electron diffraction pattern in boron arsenide (top). Image: Hu Research Lab/UCLA Samueli School of Engineering.

New material draws heat away from hotspots much faster than current materials, which could lead to dramatic improvements in computer chip performance and energy efficienc.

Working to address “hotspots” in computer chips that degrade their performance, UCLA engineers have developed a new semiconductor material, defect-free boron arsenide, that is more effective at drawing and dissipating waste heat than any other known semiconductor or metal materials.

This could potentially revolutionize thermal management designs for computer processors and other electronics, or for light-based devices like LEDs.

The study was recently published in Science and was led by Yongjie Hu, UCLA assistant professor of mechanical and aerospace engineering.

Computer processors have continued to shrink down to nanometer sizes where today there can be billions of transistors are on a single chip. This phenomenon is described under Moore’s Law, which predicts that the number of transistors on a chip will double about every two years. Each smaller generation of chips helps make computers faster, more powerful and able to do more work. But doing more work also means they’re generating more heat.

Managing heat in electronics is one of the biggest challenges in optimizing performance, in part because as as transistors become smaller, more heat is generated within the same footprint, which in turn slows down processor speeds, in particular at “hot spots” on the chips where that heat concentrates. The advance devised by UCLA has the potential to revolutionize thermal management designs for computer processors and other electronics, or for light-based devices like LEDs.

The UCLA study was the culmination of several years of research by Hu and his students that included designing and making the materials, predictive modeling, and precision measurements of temperatures.

The defect-free boron arsenide, which was made for first time by the UCLA team, has a record-high thermal conductivity, more than three-times faster at conducting heat than currently used materials, such as silicon carbide and copper, so that heat that would otherwise concentrate in hotspots is quickly flushed away.

“This material could help greatly improve performance and reduce energy demand in all kinds of electronics, from small devices to the most advanced computer data center equipment,” Hu said. “It has excellent potential to be integrated into current manufacturing processes because of its semiconductor properties and the demonstrated capability to scale-up this technology. It could replace current state-of-the-art semiconductor materials for computers and revolutionize the electronics industry.”

The study’s other authors are UCLA graduate students in Hu’s research group: Joonsang Kang, Man Li, Huan Wu, and Huuduy Nguyen.

In addition to the impact for electronic and photonics devices, the study also revealed new fundamental insights into the physics of how heat flows through a material.

“This success exemplifies the power of combining experiments and theory in new materials discovery, and I believe this approach will continue to push the scientific frontiers in many areas, including energy, electronics, and photonics applications,” Hu said.

The research was funded by the National Science Foundation, the Air Force Office of Scientific Research, the American Chemical Society’s Petroleum Research Fund, UCLA’s Sustainable LA Grand Challenge, and the Anthony and Jeanne Pritzker Family Foundation.

The study, which was published in Science, was led by Yongjie Hu, a UCLA assistant professor of mechanical and aerospace engineering.

Source: UCLA


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