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NEWS
New Manufacturing Process For SiC Power Devices Developed
October 6, 2017

Researchers from North Carolina State University (NC State) are rolling out a new manufacturing process and chip design for silicon carbide (SiC) power devices, which can be used to more efficiently regulate power in technologies that use electronics. According to information provided, the process – called PRESiCETM – was developed with support from the PowerAmerica Institute funded by the Department of Energy to make it easier for companies to enter the SiC marketplace and develop new products.

“PRESiCETM will allow more companies to get into the SiC market, because they won’t have to initially develop their own design and manufacturing process for power devices – an expensive, time-consuming engineering effort,” says Jay Baliga, Distinguished University Professor of Electrical and Computer Engineering at NC State and lead author of a paper, “PRESiCETM: PRocess Engineered for manufacturing SiC Electronic-devices,” presented recently at the International Conference on Silicon Carbide and Related Materials. “The companies can instead use the PRESiCETM technology to develop their own products. That’s good for the companies, good for consumers, and good for U.S. manufacturing.”


Silicon carbide power devices, like the one shown here, are more efficient than their silicon counterparts. Credit: North Carolina State University.

Power devices consist of a diode and transistor, and are used to regulate the flow of power in electrical devices. For decades, electronics have used silicon-based power devices. In recent years, however, some companies have begun using SiC power devices, which have two key advantages.

First, SiC power devices are more efficient, because SiC transistors lose less power. Conventional silicon transistors lose 10 percent of their energy to waste heat. SiC transistors lose only 7 percent. This is not only more efficient, but means that product designers need to do less to address cooling for the devices.

Second, SiC devices can also switch at a higher frequency. That means electronics incorporating SiC devices can have smaller capacitors and inductors – allowing designers to create smaller, lighter electronic products.

Up to this point, companies that have developed manufacturing processes for creating SiC power devices have kept their processes proprietary – making it difficult for other companies to get into the field. This has limited the participation of other companies and kept the cost of SiC devices high.

The NC State researchers developed PRESiCETM to address this bottleneck, with the goal of lowering the barrier of entry to the field for companies and increasing innovation.

The PRESiCETM team worked with a Texas-based foundry called X-Fab to implement the manufacturing process and have now qualified it – showing that it has the high yield and tight statistical distribution of electrical properties for SiC power devices necessary to make them attractive to industry.

“If more companies get involved in manufacturing SiC power devices, it will increase the volume of production at the foundry, significantly driving down costs,” Prof. Baliga says.

Right now, SiC devices cost about five times more than silicon power devices.

“Our goal is to get it down to 1.5 times the cost of silicon devices,” Prof. Baliga says. “Hopefully that will begin the ‘virtuous cycle’: lower cost will lead to higher use; higher use leads to greater production volume; greater production volume further reduces cost, and so on. And consumers are getting a better, more energy-efficient product.”

The researchers have already licensed the PRESiCETM process and chip design to one company, and are in talks with several others.


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