Aluminium gallium arsenide (also
Aluminum gallium arsenide) (
Al_{x}Ga_{1-x}As) is a
semiconductor with the very nearly the same
lattice constant[?] as
GaAs, but a larger
bandgap. The
x in the formula above is a number between 0 and 1 - this indicates an arbitrary
alloy between
GaAs and
AlAs[?].
The bandgap varies between 1.42 eV (GaAs) and 2.16 eV (AlAs).
The formula AlGaAs should be considered an abbreviated form of the above, rather than any particular ratio.
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