# Aluminium gallium arsenide

**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.