General
- Gallium
arsenide (GaAs) is a compound of two elements, gallium and arsenic. It is
an important semiconductor.
- GaAs has
some electronic properties which are superior to those of silicon.
Process
- The crystal
growth using a horizontal zone furnace (Bridgman-Stockbarger technique)
where Ga and Arsenic vapour react and deposit on a seed crystal at the
cooler end of the furnace.
- Gallium
arsenide thin films were electrodeposited from acid aqueous solution on
graphite substrates.
Market
- Japanese
manufacturers accounted for over 13% of the global GaAs device market in
2007.
- Mitsubishi
Electric remained the largest Japanese supplier of GaAs and was joined by
Eudyna Devices in the top ten.
- The largest
European GaAs device manufacturer will be UMS moving forwards. UMS ranked
12th in 2007.
Application
- It is used
to make devices such as microwave frequency integrated circuits infrared
light-emitting diodes, laser diodes and solar cells.
- Another
advantage of GaAs is that it has a direct band gap, which means that it
can be used to emit light efficiently.
- Due to its
high switching speed, GaAs would seem to be ideal for computer
applications.
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