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analoging
analoging
6/3/2013 9:53:35 PM
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Re: GaN-on-Si LEDS
Nitronex and International Rectifier have commercial RF power devices based on GaN-on-Si. SiC substrates are many times higher in cost over Si as SiC has been the substrate of choice for GaN over the last 10yrs. However, buffer layers and template transfer methods are being implemented to bridge GaN to Si. The lower cost of Si can be sold in some applications as the benefit for any lower performance  in using this substrate over SiC.

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analoging
analoging
6/1/2013 12:23:16 AM
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GaN-on-Si LEDS
GaN on Si has apps for both LEDs and high-power, high-frequency devices. However, most companies focus on one or the other. Cree on the other hand covers both devices. It started off as a SiC wafer vendor and eventually became vertically-integrated for GaN HEMTs and GaN LEDs on SiC wafers. Most LED companies use sapphire and most GaN on Si is dedicated to power ICs. The LED focus is more recent including companies such as Azzurro. 3D LEDs via the formation of micropillars on Si have been developed by Aledia. Nanoscale GaN structures on Si reduce the stress associated with the lattice mismatch.

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analoging
analoging
6/1/2013 12:18:11 AM
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status update
Glad to see an abundance of comments on this topic. One of my recent articles on this blog was related to this post. GaN on Si was considered once a dream and a myth. Naysayers are like armchair QBs on a Monday morning. It's easy to scoff at an immature technology 5-10 yrs before it is mainstream as many did in the case of GaN-on-Si. One that come from an electrical engineering perspective often quickly dismiss new potential materials systems for devices. However, materials scientists like myself simply smile and drum up solutions in the lab that surprise and amaze.

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Brad Albing
Brad Albing
5/31/2013 4:42:11 PM
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Re:GaN on Si Makes Opto Integration Possible
@Netcrawl - That is a good summary of what Brian discussed in his blog, so thanks.

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Brad Albing
Brad Albing
5/31/2013 4:02:51 PM
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Re: GaN on Si for LEDs
@Brian >>NXP has just been awarded some money from the UK government for GaN power semiconductor development. Interesting - we will all have to keep an eye on NXP - probably lots of info will be coming from them on what they are up to - so lots of blogs to be written.

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Brian Bailey
Brian Bailey
5/31/2013 11:59:32 AM
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Re: GaN on Si for LEDs
In related news out today - NXP has just been awarded some money from the UK government for GaN power semiconductor development. IN the press release they say: NXP is putting its efforts into commercializing 650-V diodes and switches based on a proprietary GaN-on-Si process technology. NXP has stated that it plans to release a portfolio of GaN discrete devices made at the Hazel Grove PowerMOS wafer fab in 2H14. The products will be targeted at applications where energy conversion efficiency is key, such as power factor correction power supplies, solar energy, motor control and automotive electronics.

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Netcrawl
Netcrawl
5/31/2013 10:06:24 AM
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Re:GaN on Si Makes Opto Integration Possible
@Brad we seen GaN's performance and properties, we have seen it in action, so what makes GaN Good or ideal? GaN is a very hard material with crystal structure, it's bandgap of 3.45 eV suit it in high power and high frequency devices, GaN's properties give it an unmatched porperties and ideal for extreme environments. I believe that GaN's wider bandgap properties give it a great advantages.  

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Netcrawl
Netcrawl
5/31/2013 9:55:19 AM
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Re: GaN on GaN
@Amrutah you're right there's so many question need to answer here like where are the market opportunities for GaN? I think the possible commercial market for GaN would be the wireless infrastructures, the massive 4G rollout would definitely drive demand for more smaller base station. 

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Netcrawl
Netcrawl
5/31/2013 9:32:54 AM
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Re:GaN on Si Makes Opto Integration Possible
@Brian thanks for the share, GaN is getting more attention these days because its has something unique, this unique material properties possesed by GaN translate into the ability to deliver high power at high frequencies, and best of all it could withstand high temperature. Excellent thermal conductivity also makes GaN a perfect stuff for very high power applications.   

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Brad Albing
Brad Albing
5/30/2013 3:01:02 PM
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Re: LED production and intensity
@RedDerek >> buying LEDs that have been screened for a certain range of illumination at a low current value. Ah - did know you were finding a lack of conformity with the LEDs. Sadly, you have to get them screened - so there goes any cost savings you might have realized.

Or sort them yourself - pro'ly tough to do with the tiny sur-mnt devices.

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