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Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Anyone know where I can get some semiconductor grade germanium? I'd like to make a replica of the first transistor to compliment my homemade LED. Possibly even make a radio with it.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I can't directly answer your question, but......research 'epitaxy'....it is 'second generation transistors'....I think first gen. was something like 'homeotaxy'....it involves getting some vacuum gear......(at least, I think it does.....I'm interested in this project).....Unless anyone else knows better.........
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
And gold electrodes......If you want to lay alternate layers of silicon and germanium you should be reading up on epitaxy.....just my opinion....for what it's worth.....
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I'll look into it. what needs tidying up on the led? It was mostly just luck because I imagine it'd be very hard to find another nicely glowing piece of SiC like that.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Sorry, I thought you'd made it somehow, I really shouldn't post after I've been drinking.
Epitaxy is basically a form of Chemical Vapour Deposition that grows single crystals. I've some literature on this stuff somewhere as I was working in a place that produces commercial systems for this, espacially the new generation of High Brightness LED's used for backlit TV's, etc.
Off the top of my head, I think they are using Gallium Arsenide for these, but I'll have to check.
SiC is still used as a substrate for growing GaN crystals for LED's.
There are at least a couple of us on here planning to try vacuum deposition of various types, I think Intrawinding is planning something along these lines as well, but I assume he's planning to start with stuff like coating lenses with aluminium (that's how most people seem to start). I'm more interested in Plasma Enhanced Chemical Vapour Deposition myself.
I assume it may be possible to grow these crystals using 'wet chemistry' (electrolysis) but I've not found any direct references to this,
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I made a diode by melting a bit of Indium into Germanium over a (cooking) gas flame (decades ago) and a transistor can be similarly made by doing both sides of a thin strip of germanium - just a matter of temperature/timing and materials.
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Germanium
