+44 (0)24 7671 8970
More publications     •     Advertise with us     •     Contact us
*/
News Article

Panasonic Develops GaN Power Transistor on Silicon

The new GaN transistor extends the operating voltages of a variety of power switching systems including inverters for industrial use and uninterruptible power supplies.

Panasonic has developed a new technique to drastically increase the blocking voltage of Gallium Nitride (GaN) -based power switching transistors on silicon (Si) substrates.

The blocking voltage of the Si substrate can be added to that of the GaN transistor by the new structure which should enable blocking voltages over 3000V. The new GaN transistor extends the operating voltages of a variety of power switching systems including inverters for industrial use and uninterruptible power supplies.

Strong electric fields are formed along the vertical direction in the GaN transistor on a conductive Si substrate at high drain voltage. Theoretically, the blocking voltage is ideally determined by the thickness of the GaN layer and the Si substrate. However, experimentally observed values have been affected by only the GaN thickness, where the Si substrate has not contributed to the blocking voltage.

 



 

Panasonic investigated the mechanism and found that the blocking voltage increase is limited by leakage current at the interface between GaN and Si caused by electrons formed as an inversion layer.

To prevent this, Panasonic has proposed a new called Blocking-Voltage-Boosting (BVB) structure which consists of selectively formed p-type regions on the surface of the Si substrates. The p-type regions prevent the inversion electrons from flowing as leakage current.

The fabricated GaN transistor on Si with the BVB structure achieves a high breakdown voltage of 2200V with the total epitaxial thickness as small as 1.9 microns. This value is approximately five times higher than that in the conventional GaN transistor on Si with the same thickness of GaN.

Further increase of the epitaxial thickness will enable break down voltages over 3000V with existing epitaxial technologies. The GaN transistor on Si with the BVB structure will be applicable to various switching systems with higher operating voltages

Applications for 99 domestic and 64 overseas patents have been filed. These results were presented at the International Electron Devices Meeting 2010, held in San Francisco, U.S. between December 6 and 8, 2010.

Panasonic Corporation is a leader in the development and manufacture of electronic products for a wide range of consumer, business, and industrial needs. Based in Osaka, Japan, the company recorded consolidated net sales of 7.42 trillion yen (US$79.4 billion) for the year ended March 31, 2010.
Connecting the Compound Semiconductor Industry

The 13th CS International conference builds on the strengths of its predecessors, with around 40 leaders from industry and academia delivering presentations that fall within five key themes: Ultrafast Communication; Making Headway with the MicroLED; Taking the Power from Silicon, New Vectors for the VCSEL, and Ultra-wide Bandgap Devices.

Delegates attending these sessions will gain insight into device technology, find out about the current status and the roadmap for the compound semiconductor industry, and discover the latest advances in tools and processes that will drive up fab yields and throughputs.

To discover our sponsorship and exhibition opportunities, contact us at:

Email: info@csinternational.net
Phone: +44 (0)24 7671 8970

To register your place as a delegate, visit: https://csinternational.net/register

Register
×
Search the news archive

To close this popup you can press escape or click the close icon.
×
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in: