Xref: utzoo rec.ham-radio:8223 sci.electronics:4859
Path: utzoo!utgpu!attcan!uunet!lll-winken!ames!mailrus!cornell!uw-beaver!ssc-vax!uvicctr!collinge
From: collinge@uvicctr.UUCP (Doug Collinge)
Newsgroups: rec.ham-radio,sci.electronics
Subject: How do FETs REALLY work?
Message-ID: <609@uvicctr.UUCP>
Date: 26 Jan 89 04:08:56 GMT
Reply-To: collinge@uvicctr.UUCP (Doug Collinge)
Organization: University of Victoria, Victoria B.C. Canada
Lines: 32


OK, net, here's a question for you:

I know what a real MOSFET looks like and I have a vague notion of how it
works but how about this:  Say we get a piece of, say, N type silicon and
we oxidize it and stick on a gate.  Now we etch the Si so that it is very
thin under the gate.  Is this thing now a MOSFET even though there is no
junction nearby?  Does the MOSFET actually need the junction between the
substrate and the channel?

Next step: replace the semiconductor with a metal (Making a MOMFET!) -
increasing the gate voltage to a sufficiently high level should eventually
drive away all the free electrons rendering the channel an insulator.
What field strength would this require?

Lastly:  for my own arcane reasons I am interested in actually making a
transistor.  I don't want to have to make ultrapure silicon - is there
some other semiconductor (e.g., copper oxide) that would be easier to
use?  I don't care if it is a good transistor; gains of around 10 would
be just fine.

While we are at it:  I read somewhere that when junction transistors were
perfected research on point-contact transistors ceased and that they are
still poorly understood.  Is this true?  If not, how do they work?
-- 
		Doug Collinge
		School of Music, University of Victoria,
		PO Box 1700, Victoria, B.C., Canada,  V8W 2Y2  
		collinge@uvunix.BITNET
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