Seren Photonics and BluGlass collaboration results in successful semipolar GaN template process transfer

Seren Photonics Limited, based near Cardiff, Wales, UK, a developer of semipolar gallium nitride and BluGlass Limited of Silverwater, Australia, a developer of semiconductor manufacturing process and equipment have announced the completion of phase 1 of the transfer of Seren’s semipolar GaN template process to the BluGlass MOCVD epitaxial services.

A collaboration between the two firms began in late 2016, with the aim of transferring the manufacturing process from laboratory scale equipment onto a production MOCVD platform. Phase 2 will focus on refining the manufacturing process with an emphasis on improving uniformity and yield, whilst parallel development will continue to focus on further reduction in defect density.

Semipolar gallium nitride (GaN) is an alternative crystal plane that overcomes many of the problems associated with the green gap (inability to make an efficient green LED) and also LED efficiency droop (where LEDs become progressively less efficient at high powers). Previously, semipolar GaN was only available in small pieces, cut from a bulk GaN crystal. However, the Seren technology creates high quality semipolar GaN on industry standard 2”, 4” and 6” sapphire wafers, enabling commercially viable semipolar devices, said the firms.

Dr. Bedwyr Humphreys, Seren’s Chief Development Officer said, “It’s great to see a process that was developed in a university lab successfully scale up on to a production relevant platform. The focus now is on moving the product development to the next stage where we can start to look at refining the process. We had always designed the process with production in mind so it’s really exciting to see this basic process demonstrated on a 19 x 2” MOCVD reactor, which now means we can sample in much larger quantities than before”,

The lack of an efficient green LED has limited the market size for many applications requiring RGB LEDs, e.g. colour controlled lamps in general lighting. As well as reducing barriers for existing applications, an increasingly efficient green LED technology is also an enabler for new technologies such as the rapidly emerging RGB microLED space – expected to be used in next generation display technology due of its low power consumption and vivid colour. Both Apple and Facebook are known to have acquired microLED start-ups during the last 3 years.

BluGlass Managing Director, Giles Bourne said, “It’s great to see another BluGlass foundry customer achieve a successful technology demonstration, with the completion of Phase I. We look forward to continuing to assist Seren deliver the successful completion of the next phase of development”. He added “BluGlass selects its customers based on the potential benefits to the nitrides industry, as we seek to work with the next generation of technology developers.”

Seren’s Chairman Dr Godfrey Ainsworth added “We’ve always had a vision that Seren’s technology can help transform the LED industry, especially for green LEDs. This successful first phase transfer is another major milestone in our development as a supplier of semipolar GaN products”.