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Mar 7th, 2013
 
Bluglass achieves critical milestone: producing p-GaN films that meet industry benchmarks
 
Australian clean technology innovator, BluGlass Limited (ASX: BLG) announced that it has succeeded in producing p-type gallium nitride (GaN) films with industry equivalent electrical properties using its breakthrough low temperature Remote Plasma Chemical Vapour Deposition (RPCVD) technology when grown on top of MOCVD GaN templates.
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Key Points

  • Low temperature RPCVD technology meets the existing commercial p-GaN standard for high temperature MOCVD equipment
  • Electrical properties independently verified by expert third party
  • Next goal is to demonstrate improved LED light output (lumens per watt) by creating devices using the BluGlass low temperature p-GaN layer

BluGlass has successfully demonstrated p-GaN films grown at low temperature with electrical properties equivalent to films grown using the industry standard process –MOCVD. This breakthrough follows on from the company’s proof of concept milestone achievement late last year. Having demonstrated these material specifications BluGlass is now in a position to commence experiments targeting improved LED device efficiency using RPCVD grown p-GaN layers to demonstrate the commercial value of a low temperature technology.

Room temperature hall measurement results of an RPCVD p-GaN film grown on a commercial GaN template compared to a typical MOCVD grown p-GaN film

BluGlass contracted The Australian National University (ANU), a leading university in semiconductor physics, to independently measure and verify the electrical properties of the samples. The metal contacts required to perform the electrical measurements were prepared by the Australian National Fabrication Facility (ANFF).

Giles Bourne, BluGlass CEO, said “The technology team is making increasingly rapid progress in the development of our platform technology and technical milestones to prove the competitive advantages of the low temperature RPCVD technology.

With a lower growth temperature than MOCVD, BluGlass’ proprietary technology, RPCVD has the potential to allow LED manufacturers to create higher performing devices by reducing the multi–quantum well or active region’s exposure to high temperatures which currently leads to a performance loss (see Figure One below).

Figre one: Bluglass is targeting low temperature p-GaN as the first commercial opportunity for its proprietary RPCVD technology.

LED Device Terms:
p-GaN (or p-type GaN) refers to a GaN film that has been doped (i.e. the process of adding certain type of atoms-in this case with magnesium) to increase the number of free charge carriers (in this case positive holes)
n-GaN (or n-type GaN) refers to a GaN film that has been doped (i.e. the process of adding certain type of atoms-in this case with silicon) to increase the number of free charge carriers (in this case negative electrons)

About BluGlass:
BluGlass Limited is an Australian green technology company formed to commercialise a breakthrough in the Semiconductor Industry. BluGlass has invented a new process using Remote Plasma Chemical Vapour Deposition (RPCVD) to grow semiconductor materials such as gallium nitride (GaN) and indium gallium nitride (InGaN), crucial to the production of high efficiency devices such as next generation lighting technology Light Emitting Diodes (LEDs) with advanced low cost potential.

The RPCVD technology, because of its low temperature and highly flexible nature, offers many potential benefits over existing technologies including higher efficiency, lower cost and greater scalability.

 
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