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Contactless SiC Plasma Epi-prep Gets Further Validation

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Oxford Instruments validates power devices with technology acceleration partner Clas-SiC

Recently Oxford Instruments announced the launch of its SiC substrate contactless plasma polishing solution. The aim is to supersede established CMP processes with a clean, dry, lower cost, higher yield and sustainable alternative.

The project has taken a step forward by collaborating with Clas-Sic and qualifying whole wafer 1200V MOSFET devices, further boosting confidence in the new solution and its impact on SiC power semiconductor devices. The picture above shows the Clas-Sic MPD device yield.

"The 1200V MOSFET parametric results and yield are very encouraging, being very comparable to those of conventionally CMP prepared wafers which were used as a direct comparison, " comments David Clark, technology and customer relations manager at Clas-SiC.

He added: "We rely on multiple vendors for substrates due to supply limitations, so incoming material variability is a challenge across the device manufacture industry. The fact that substrates were sourced, processed at Oxford Instruments, incorporated into our production flow on two separate device types and achieved such comparable results so soon, should give Oxford Instruments confidence that their process window is robust and fit for purpose.

"For a first result this is a hugely positive outcome and gives confidence that Oxford Instrument's new technology has a great future in reducing the cost of the very expensive incoming SiC substrates. This will be very important in reducing the cost of SiC based power converters and in increasing their adoption in the marketplace", Clark concluded.

Demand currently exceeds supply for SiC substrates, and the wide band gap semiconductors that are manufactured on the substrates are also in short supply. This production gap is set to exponentially increase, as high-growth electric vehicle and sustainable energy markets incorporate ever increasing amounts of these compound semiconductors into their applications, so new solutions are therefore needed.

According to Oxford Instruments, plasma polishing is a plug and play alternative to CMP, that straightaway reduces the cost per wafer with reduced OPEX, but is also a key enabling technology to accelerate the transition to thinner slices and more wafers per boule at 150mm and 200mm. The company believes this and other innovative SiC technologies, have the potential to shift the production paradigm, so that SiC supply chains can comfortably support high-growth technology markets in a sustainable way.

Oxford Instruments will share full wafer MOSFET performance data at ICSCRM, in Davos Switzerland 11-16 September 2022. There will also be an opportunity to speak in person at the event to discuss implementing Plasma Polish in high volume manufacturing fabs.

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