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Silicon Carbide MOSFET's

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Martin King

Mon Jan 31 2011, 03:14PM

Registered Member #3040 Joined: Tue Jul 27 2010, 03:15PM
Location: South of London. UK
Posts: 237

Interesting

Hmmm They left "Tesla coil drivers" off the applications list!

Martin.

Mattski

Mon Jan 31 2011, 04:45PM

Registered Member #1792 Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527

Looks like they're already in stock at Digikey for $93.75!

Patrick

Tue Feb 01 2011, 12:59AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

I would love to have these, but dam expensive.

Proud Mary

Tue Feb 01 2011, 01:21AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Me too! Lookee here!

Silicon carbide for high resolution X-ray detectors operating up to 100Â°C
Giuseppe Bertuccio, Roberto Casiraghi Antonio Cetronio, Claudio Lanzieri and Filippo Nava
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume 522, Issue 3, 21 April 2004, Pages 413-419

Abstract

This work presents experimental results on the possibility of high resolution X-ray spectroscopy in a wide temperature range, from room temperature up to 100Â°C without any cooling system, using Silicon Carbide (SiC) detectors. This capability arises from the very low noise of SiC detectors at high temperature because of their extremely low-leakage current density (20 pA/cm2 at 24Â°C and 1 nA/cm2 at 107Â°C with mean electric fields of 120 kV/cm). Spectra of 241Am acquired by a pixel SiC detector are reported with equivalent noise energies of 315 eV FWHM at 27Â°C and 797 eV FWHM at 100Â°C. The contributions of the different noise sources of the detector and of the front-end electronics are determined and analyzed. The potential for SiC X-ray detectors and open issues in SiC technology are highlighted.

rp181

Tue Feb 01 2011, 02:29AM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529

I interned at a lab that focused on this:

The equipment next to the fume hood is a VP508 CVD reactor. You can see the gas control cabinets in the very back that controlled nitrogen, argon, propane, and silane gas. The piece the guy is working at is a Residual Gas analyzer.
I did most of my work on graphene grown on SiC.

Heres a rather bad powerpoint I made at the end. Anyway, my point is the degradation as more and more steps were taken. I recall they made some demo schottky diodes a while back.

BTW, one if the slides mentions a textured surface. We later found out that this was actually not the surface, but the back of the wafer. Results were better once the SEM was lowered to 5kV.

]final_presentation.pdf[/file]

Wish i was allowed to take pictures, there was some cool stuff in that one lab, not to mention the entire Electronics division and the whole campus.

Patrick

Tue Feb 01 2011, 04:16AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Proud Mary wrote ...

because of their extremely low-leakage current density (20 pA/cm2 at 24Â°C and 1 nA/cm2 at 107Â°C with mean electric fields of 120 kV/cm). Spectra of 241Am acquired by a pixel SiC detector are reported with equivalent noise energies of 315 eV FWHM at 27Â°C and 797 eV FWHM at 100Â°C.

Thats pretty cool, no expert on semi's, but I know these specs are gooooooood. Ive been waiting for these promised devices for more then 2 years! (mostly diodes and transistors) the spectra idea is all over my head as per usuall Proud Mary.

Steve Conner

Tue Feb 01 2011, 09:41AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Oh, cool. SiC power JFETs have been out for a while. Steve Ward and I looked at them, and we concluded that they were nothing special for DRSSTC work.

But they might be worth a try, the awesome new Cree MOSFETs may drive down the price of the old JFETs.

Adam Munich

Wed Feb 02 2011, 04:55AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

Heh, the sample button on cree's site leads me right to digikey. Dang.

Proud Mary

Thu Feb 03 2011, 05:19PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

I've just ordered this inexpensive piece of SiC from an ebay seller in Poland.

It looks to be only semi-refined which is all to the good, as it may contain all sorts of interesting dopants.

I'll try it with assorted cat's whiskers to start with - bronze, gold, and so on, in the way of the crystal and cat's whisker wireless sets of long ago.

My main interest is to use it for radiation detection experiments, but I'll give it a go as a demodulator for a bit of fun.

cedric

Thu Feb 03 2011, 05:48PM

Registered Member #2941 Joined: Fri Jun 25 2010, 08:08AM
Location:
Posts: 143

Proud Mary wrote ...

I've just ordered this inexpensive piece of SiC from an ebay seller in Poland.

It looks to be only semi-refined which is all to the good, as it may contain all sorts of interesting dopants.

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