Kyma Updates Progress in Crystalline AlGaN and AlN Materials Development

08 June 2011 - Raleigh, NC

Kyma Technologies, Inc., a leading supplier of crystalline nitride semiconductor materials, is pleased to provide an update on its progress in crystalline AlGaN and AlN materials development and to state its desire to collaborate with bulk AlN developers interested in improving the optical transparency of their materials.

Kyma has over a decade of experience in the fabrication of AlN templates which are thin films of crystalline AlN deposited on sapphire, silicon, or silicon carbide substrates, using Kyma’s patented and proprietary III-N Plasma Vapor Deposition of NanoColumns (PVDNC) technology.  These products are gaining acceptance with customers engaged in blue and green light emitting diode (LED) manufacturing.  The nanocolumnar nature of Kyma’s PVDNC AlN templates present an excellent surface for nucleating GaN buffer layers which then can be followed by a high quality GaN LED device structure.

Recently Kyma began extending its process capabilities to develop materials which are designed to support high Al content device layer structures.  Such structures are of interest for ultraviolet (UV) and high temperature and high power electronics applications.

Keith Evans, Kyma’s president & CEO, stated: “While our PVDNC AlN templates are excellent substrates for manufacturing GaN-rich devices such as blue and green LEDs and AlGaN/GaN field effect transistors (FETs), we are also employing other processes to develop materials that are specifically tailored to support the manufacturing of AlN-rich devices such as mid UV LEDs for germicidal irradiation and AlN/AlGaN FETs for temperature insensitive high power electronics applications.”

Towards these goals, Kyma is exploring and has made significant progress in the growth of crystalline AlN and AlGaN materials using high growth rate hydride vapor phase epitaxy (HVPE).

By adding a novel Al source to their HVPE tools, Kyma is now able to grow crystalline AlN and a broad range of AlGaN compositions.  And just like GaN HVPE, the structural quality of the HVPE grown AlN and AlGaN crystals are influenced by the seed crystal that they are grown upon.

Kyma has already demonstrated the ability to deposit crystalline AlN by HVPE on a range of starting seed materials, including on AlN structures which were produced by other techniques.

Ed Preble, Kyma’s CTO & VP business development, stated, “Our AlN HVPE process appears to have many of the traits of our GaN HVPE process.  We are able to rapidly replicate the quality of the underlying seed and in certain cases then improve its quality as we continue to grow the crystal.”

“Additionally, optical transmission measurements show that our HVPE grown AlN materials have high transparency in the 200nm to 400nm spectral region, an important feature for UV LED applications, and a noted advantage over some competing AlN crystal growth approaches,” added Preble.

Kyma is currently seeking partnerships with bulk AlN materials developers who are interested in the possibility of improving the optical properties of their materials.

To inquire about such a partnership possibility, contact Dr. Evans at This email address is being protected from spambots. You need JavaScript enabled to view it. .

About Kyma Technologies

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

The market for nitride semiconductor devices was $12B in 2010 and is expected to reach $90B over the long term, including $60B in visible lighting applications and $30B in power electronics applications.

For more information about Kyma Technologies, visit www.kymatech.com, e-mail This email address is being protected from spambots. You need JavaScript enabled to view it. , or call the company directly at 919.789.8880.

Kyma is a registered trademark of Kyma Technologies, Inc.