Gallium arsenide
= Gallium arsenide
{tag=Semiconductor}
{title2=$\mathrm{GaAs}$}
= GaAs
{c}
{synonym}
<Gallium arsenide> is the binary semiconductor $\mathrm{GaAs}$, containing one gallium <atom> per arsenic <atom> in its ideal composition. Its common zinc-blende-related structure is distinct from a simple mixture of elemental gallium and arsenic.
Its direct band gap supports optical transitions useful in emitters and photodetectors. Crystal defects, doping, and interfaces affect device behaviour in addition to the bulk <chemical formula>.
https://www.slac.stanford.edu/pubs/slacpubs/4500/slac-pub-4656.pdf[Primary GaAs photoemission account: direct-gap semiconductor and optical excitation]{ref}