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Kyma adds n+ bulk GaN substrates to its portfolio

The new gallium nitride substrates come in form factors of 10 mm x 10mm squares and 18 mm x 18 mm squares. The firm is also developing 2” diameter and larger n+ bulk GaN substrates for volume production.

Kyma’s  new n+ GaN substrate product line will boast a bulk resistivity specification of  < 0.02 Ω -cm, which is two orders of magnitude lower in resistivity than Kyma’s previously offered n-type GaN. 


What’s more, Kyma has successfully produced n+ bulk GaN wafers with measured carrier concentrations of up to 6 x 1018cm-3and corresponding bulk resistivities of < 0.005 Ω –cm.  The firm’s n-type GaN product is still being offered and, for distinction, is being relabelled as n- GaN (“nminus” GaN). 

Kyma says that although its n- GaN remains an excellent starting material for a variety of materials and device studies, its n+ GaN offers benefits for vertical devices as well as reduced contact resistance for all devices.  Key advantages for vertical power devices include ultra-low on-resistance as well as decreased parasitic resistance.  Key advantages for LEDs include low vertical resistance and the mitigation of current crowding effects.

“We are pleased to respond to our customers’ requests for more conductive substrates,” said Jacob Leach, Kyma Characterisation and Device Engineer. “The high electron concentrations in this new product line directly support higher performance and reliability for a number of device applications of great commercial interest.”

Tamara Stephenson, Kyma’s Technical Sales Engineer, added, “We are happy to offer these new substrates in form factors of 10 mm x 10mm squares and 18 mm x 18 mm squares. Additionally, the development of commercially available 2” diameter and larger n+ bulk GaN substrates is underway.”

Kyma is a supplier of crystalline GaN and AlN materials for a broad range of high performance nitride semiconductor device applications.

The market for nitride semiconductor devices is expected to surpass $90B over the long term, including over $60B in visible lighting applications and over $30B in power electronics applications.
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