In Reply to: Compound semiconductors posted by shrini on 04/08/00 at 2:43 AM:
: Advantages of compound semiconductors over normal
Just briefly, we can touch on several items from an extremely simplistic point of view.
Gallium arsenide (Ga As) has been used for many years in infra-red light emitting diodes. When you add phosphorus to get Gallium Arsenide Phosphide (GA As P) the emiited light becomes visible.
There are also gallium arsenide transistors which are very fast because of the higher electron mobility than silicon alone can offer.
On the other hand, IBM and others announced some time ago, that they were developing transistors made of a combination of silicon and germanium whose speed would be, and is, a challenge to gallium arsenide.
Then, just this past week I think, Motorola announced newly designed transistors combining silicon, germanium and carbon!
It just goes on and on as it were, but if you're interested, you can research each of these things on various web sites.
John Dunn - President